cluster-api: Bump kubekins image for main to 1.30 to use go 1.22

[chrischdi]

Bumps kubekins for the tests running against the main branch of CAPI.

This is ok to do because release-1.7 branch got created for the next release.

[sbueringer]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrischdi, sbueringer

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• config/jobs/kubernetes-sigs/cluster-api/OWNERS [chrischdi,sbueringer]

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[k8s-ci-robot]

@chrischdi: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key cluster-api-main-periodics-upgrades.yaml using file config/jobs/kubernetes-sigs/cluster-api/cluster-api-main-periodics-upgrades.yaml
• key cluster-api-main-periodics.yaml using file config/jobs/kubernetes-sigs/cluster-api/cluster-api-main-periodics.yaml
• key cluster-api-main-presubmits.yaml using file config/jobs/kubernetes-sigs/cluster-api/cluster-api-main-presubmits.yaml
• key cluster-api-prowjob-gen.yaml using file config/jobs/kubernetes-sigs/cluster-api/cluster-api-prowjob-gen.yaml

In response to this:

Bumps kubekins for the tests running against the main branch of CAPI.

This is ok to do because release-1.7 branch got created for the next release.

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