Migrate apiserver to registry.k8s.io

[hh]

Part of https://github.com/kubernetes/k8s.io/issues/4738

[k8s-ci-robot]

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[liggitt]

per https://github.com/kubernetes/apiserver#where-does-it-come-from:

apiserver is synced from https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apiserver. Code changes are made in that location, merged into k8s.io/kubernetes and later synced here.

/close

[k8s-ci-robot]

@liggitt: Closed this PR.

In response to [this](https://github.com/kubernetes/apiserver/pull/91#issuecomment-1422993347): >per https://github.com/kubernetes/apiserver#where-does-it-come-from: > >> apiserver is synced from https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apiserver. Code changes are made in that location, merged into k8s.io/kubernetes and later synced here. > >/close Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[liggitt]

commented at https://github.com/kubernetes/k8s.io/issues/4738#issuecomment-1422995341, the pod-security-admission one listed is the same