[release-1.12] 🌱 Set base branch correctly for link checker

[fabriziopandini]

What this PR does / why we need it:
Part of 1.12-rc.0 release tasks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[fabriziopandini]

/test ?

[k8s-ci-robot]

@fabriziopandini: The following commands are available to trigger required jobs:

• /test pull-cluster-api-provider-vsphere-e2e-vcsim-govmomi-release-1-12
• /test pull-cluster-api-provider-vsphere-e2e-vcsim-supervisor-release-1-12
• /test pull-cluster-api-provider-vsphere-test-release-1-12
• /test pull-cluster-api-provider-vsphere-verify-release-1-12

The following commands are available to trigger optional jobs:

• /test pull-cluster-api-provider-vsphere-apidiff-release-1-12

Use /test all to run the following jobs that were automatically triggered:

• pull-cluster-api-provider-vsphere-verify-release-1-12

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/test ?

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[fabriziopandini]

/close

[k8s-ci-robot]

@fabriziopandini: Closed this PR.

In response to this:

/close

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