This patch prepares the repository for moving to the "main" branch.
The following steps were taken to identify and change valid occurrences
of "master" to "main":

1. Replace obvious patterns:

    grep -rIl 'govmomi/[^/]\{1,\}/master' * | xargs -n1 -I% \
      sed -i.m2m -e 's~govmomi/\(.*\)/master~govmomi/\1/main~g' % && \
      find . -name '*.m2m' -type f -delete

2. Replace instances in `RELEASE.md`:

    sed -i.m2m -e 's~master~main~g' RELEASE.md && rm -f RELEASE.md.m2m

3. Replace instances in `CONTRIBUTING.md`:

    sed -i.m2m -e 's~vmware/master~main~g' CONTRIBUTING.md && \
      rm -f CONTRIBUTING.md.m2m

4. Replace instances in `.goreleaser.yml`:

    sed -i.m2m -e 's~govmomi/\(.*\)/master~govmomi/\1/main~g' \
      .goreleaser.yml && rm -f .goreleaser.yml.m2m

5. Replace instances in GitHub workflows:

    grep -rIl "'main', 'master'" .github/* | xargs -n1 -I% \
      sed -i.m2m -e "s~'main', 'master'~'main'~g" % && \
      find .github -name '*.m2m' -type f -delete

    grep -rIl '"main", "master"' .github/* | xargs -n1 -I% \
      sed -i.m2m -e 's~"main", "master"~"main"~g' % && \
      find .github -name '*.m2m' -type f -delete

    sed -i.m2m -e 's~master~main~g' \
      .github/workflows/codeql-analysis.yml && \
      rm -f .github/workflows/codeql-analysis.yml.m2m

    sed -i.m2m -e 's~master branch~main branch~g' \
      -e 's~refs/heads/master~refs/heads/main~g' \
      -e 's~ref: "master"~ref: "main"~g' \
      .github/workflows/govmomi-release.yaml && \
      rm -f .github/workflows/govmomi-release.yaml.m2m

    grep -rIl 'govmomi/[^/]\{1,\}/master' .github/* | xargs -n1 -I% \
      sed -i.m2m -e 's~govmomi/\(.*\)/master~govmomi/\1/main~g' % && \
      find .github -name '*.m2m' -type f -delete

6. Replace the project's default version:

    sed -i.m2m 's~master~main~g' ./internal/version/version.go && \
      rm -f ./internal/version/version.go.m2m

7. Searched for all other instances of the word `master` and manually
   verified they do not refer to this repository:

    find . -type f -not -path './.git/*' -exec grep -IH master \{\} \;

   For example:

    $ find . -type f -not -path './.git/*' -exec grep -IH master \{\} \;
    ./CHANGELOG.md:- [0422a070]	Merge branch 'master' into pc/HardwareInfoNotReplicatingInCloning
    ./CHANGELOG.md:- [a5c9e1f0]	Merge branch 'master' into master
    ./CHANGELOG.md:- [86375ceb]	Merge branch 'master' into fields-info
    ./CHANGELOG.md:- [26ba22de]	Merge branch 'gavrie-master'
    ./CHANGELOG.md:- [8dbb438b]	Merge remote-tracking branch 'upstream/master' into event_manager
    ./govc/flags/int64.go:// https://github.com/golang/go/blob/master/src/cmd/internal/obj/flag.go
    ./govc/flags/int32.go:// https://github.com/golang/go/blob/master/src/cmd/internal/obj/flag.go
    ./govc/test/images/update.sh:wget -qN https://github.com/icebreaker/floppybird/raw/master/build/floppybird.img
    ./govc/test/README.md:        curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash
    ./govc/test/vendor/manifest:			"branch": "master",
    ./govc/USAGE.md:  -mgmt-network.floating-IP=               Optional. The Floating IP used by the HA master cluster in the when network Mode is DHCP.
    ./govc/namespace/cluster/enable.go:	ControlPlaneManagementNetwork          masterManagementNetwork
    ./govc/namespace/cluster/enable.go:type masterManagementNetwork struct {
    ./govc/namespace/cluster/enable.go:		ControlPlaneManagementNetwork: masterManagementNetwork{
    ./govc/namespace/cluster/enable.go:		"Optional. The Floating IP used by the HA master cluster in the when network Mode is DHCP.")
    ./govc/namespace/cluster/enable.go:	var masterManagementNetwork *namespace.MasterManagementNetwork
    ./govc/namespace/cluster/enable.go:		masterManagementNetwork = &namespace.MasterManagementNetwork{}
    ./govc/namespace/cluster/enable.go:		masterManagementNetwork.AddressRange = cmd.ControlPlaneManagementNetwork.AddressRange
    ./govc/namespace/cluster/enable.go:		masterManagementNetwork.FloatingIP = cmd.ControlPlaneManagementNetwork.FloatingIP
    ./govc/namespace/cluster/enable.go:		masterManagementNetwork.Mode = &ipam
    ./govc/namespace/cluster/enable.go:		masterManagementNetwork.Network = cmd.ControlPlaneManagementNetwork.Network
    ./govc/namespace/cluster/enable.go:	if masterManagementNetwork != nil {
    ./govc/namespace/cluster/enable.go:		if (masterManagementNetwork.AddressRange.SubnetMask == "") &&
    ./govc/namespace/cluster/enable.go:			(masterManagementNetwork.AddressRange.StartingAddress == "") &&
    ./govc/namespace/cluster/enable.go:			(masterManagementNetwork.AddressRange.Gateway == "") &&
    ./govc/namespace/cluster/enable.go:			(masterManagementNetwork.AddressRange.AddressCount == 0) {
    ./govc/namespace/cluster/enable.go:			masterManagementNetwork.AddressRange = nil
    ./govc/namespace/cluster/enable.go:		masterManagementNetwork.Network = refs.Network
    ./govc/namespace/cluster/enable.go:		MasterManagementNetwork:                masterManagementNetwork,
    ./govc/README.md:* [Create a Debian VM](https://github.com/kubernetes/kubernetes/tree/master/cluster/vsphere)
    ./govc/README.md:* [Create a Windows VM](https://github.com/dougm/govc-windows-box/blob/master/provision-esx.sh)
    ./govc/vm/rdm/attach.go://This file in particular https://github.com/codedellemc/govmax/blob/master/api/v1/vmomi.go
    ./vim25/types/enum.go:	ClusterDasFdmAvailabilityStateMaster                       = ClusterDasFdmAvailabilityState("master")
    ./vim25/types/enum.go:	VsanHostNodeStateMaster                  = VsanHostNodeState("master")
    ./vim25/mo/retrieve_test.go:	if vm.Config.Name != "kubernetes-master" {
    ./vim25/mo/fixtures/nested_property.xml:      <val xsi:type="xsd:string">kubernetes-master</val>
    ./gen/sdk/vim-types.xsd:         <enumeration value="master" />
    ./gen/sdk/vim-types.xsd:         <enumeration value="master" />
    ./gen/sdk/internalvim-types.xsd:         <enumeration value="master" />
    ./gen/sdk/internalvim-types.xsd:         <enumeration value="master" />
    ./README.md:[project-docker-linuxKit]: https://github.com/linuxkit/linuxkit/tree/master/src/cmd/linuxkit
    ./README.md:[project-influxdata-telegraf]: https://github.com/influxdata/telegraf/tree/master/plugins/inputs/vsphere
    ./README.md:[project-rancher]: https://github.com/rancher/rancher/blob/master/pkg/api/norman/customization/vsphere/listers.go
    ./vcsim/README.md:* [Kubernetes](https://github.com/kubernetes/kubernetes/tree/master/pkg/cloudprovider/providers/vsphere)
    ./vcsim/README.md:* [Telegraf](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/vsphere)
    ./vcsim/README.md:* [LocalStack](https://github.com/localstack/localstack/blob/master/README.md#why-localstack)
    ./toolbox/README.md:* [VIC tether toolbox extension](https://github.com/vmware/vic/blob/master/lib/tether/toolbox.go)
    ./toolbox/README.md:* [VIC container host tether](https://github.com/vmware/vic/blob/master/cmd/vic-init/main_linux.go)
    ./toolbox/hgfs/server.go:// See: https://github.com/vmware/open-vm-tools/blob/master/open-vm-tools/lib/hgfsServer/hgfsServer.c
    ./toolbox/hgfs/protocol.go:// See: https://github.com/vmware/open-vm-tools/blob/master/open-vm-tools/lib/include/hgfsProto.h
    ./scripts/devbox/README.md:This script is a fork of the [VIC devbox](https://github.com/vmware/vic/tree/master/infra/machines/devbox),
    ./scripts/devbox/README.md:[vcp]:https://github.com/kubernetes/kubernetes/tree/master/pkg/cloudprovider/providers/vsphere
    ./scripts/devbox/README.md:As an alternative to the [VIC devbox](https://github.com/vmware/vic/tree/master/infra/machines/devbox).
    ./.github/workflows/govmomi-go-lint.yaml:          curl -sfL https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh | sh -s -- -b "${TEMP_PATH}" 2>&1
    ./.github/workflows/govmomi-release.yaml:            > Due to a [limitation](https://github.com/peter-evans/create-pull-request/blob/master/docs/concepts-guidelines.md#triggering-further-workflow-runs) in Github Actions please **close and immediately reopen** this PR to trigger the required workflow checks before merging.
    ./vapi/namespace/namespace.go:	MasterDNSSearchDomains []string               `json:"master_DNS_search_domains,omitempty"`
    ./vapi/namespace/namespace.go:	MasterManagementNetwork *MasterManagementNetwork    `json:"master_management_network"`
    ./vapi/namespace/namespace.go:	MasterNTPServers        []string                    `json:"master_NTP_servers,omitempty"`
    ./vapi/namespace/namespace.go:	MasterDNS            []string              `json:"master_DNS,omitempty"`
    ./vapi/namespace/namespace.go:	MasterStoragePolicy                    string                  `json:"master_storage_policy,omitempty"`
    ./vsan/types/types.go:	Master  string   `xml:"master"`
    ./vsan/types/types.go:	MasterInfo     *VsanPerfMasterInformation `xml:"masterInfo,omitempty"`

BREAKING:

Changing GoVmomi's default branch from `master` to `main` will likely result
in dependents needing to repoint their clients and other integrations to
the new, default branch.