Migrate to policy/v1beta1 API

[0xMH]

Migrate to use the policy/v1beta1 API, available since v1.10. Because PodSecurityPolicy in the extensions/v1beta1 is a Deprecated API Removed In 1.16.

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[0xMH]

/assign @jsafrane

[kmova]

Thank you @0xMH for this fix. The NFS client code is being migrated to https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner. This change has been taken up as part of this migration PR. kubernetes-sigs/nfs-subdir-external-provisioner@234543e

[nikhita]

@0xMH Thanks for your PR! As @kmova mentioned, we are in the process of archiving this repo and are no longer accepting new PRs here. Please see kubernetes/org#1563 for more details.

Looks like your commit got bundled up into the migration PR though. :)