cluster-api: update capi milestone applier for release-1.7

[cahillsf]

xref: kubernetes-sigs/cluster-api#9800

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
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[sbueringer]

/lgtm
/approve

[sbueringer]

/assign @dims
Thank you :)

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cahillsf, dims, sbueringer

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[k8s-ci-robot]

@cahillsf: Updated the plugins configmap in namespace default at cluster test-infra-trusted using the following files:

• key plugins.yaml using file config/prow/plugins.yaml

In response to this:

xref: kubernetes-sigs/cluster-api#9800

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