Bump k8s versions in alpha and stable channels

[olemarkus]

Bumping alpha channel k8s versions to stable. They have been sitting in alpha for quite some time now.
Also bumping k8s in the alpha channels to the recently released ones.

[k8s-ci-robot]

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[granular-ryanbonham]

/ok-to-test

[idealhack]

thanks! we should also bump the versions of kubernetesVersions section in alpha channel, see my commit idealhack@d0460d0, otherwise lgtm.

[olemarkus]

I knew there was something I had forgotten there. Thanks.

Should be fixed now.

[idealhack]

/lgtm

[rifelpet]

/approve
/lgtm
thanks!

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This pull-request has been approved by: olemarkus, rifelpet

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