Use k8s-staging-test-infra images for base images.

[michelle192837]

Switch the image bases to use those built in k8s-staging-test-infra instead. Ref https://github.com/kubernetes/test-infra/issues/32432.

Atm: Just doing this for the alpine and git-custom-k8s-auth images.

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[michelle192837]

/hold

Actually, I think the autobump needs an update first before this.

[michelle192837]

/hold cancel

Wait no, these aren't autobumped, that migration will need to happen once we switch the actual k8s-prow/ images over to the ones built in the new location. This should be fine.

Need to look into the test failure though.

[michelle192837]

/retest

[ameukam]

/lgtm cc @droslean @matthyx

[matthyx]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matthyx, michelle192837

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