Bump minimum kubernetes version to 1.23

[psschwei]

Signed-off-by: Paul S. Schweigert [email protected]

xref: https://github.com/knative/pkg/pull/2595

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[abrennan89]

/lgtm /approve

@psschwei is this only for the upcoming latest version or does it need to be cherrypicked to any others?

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abrennan89, psschwei

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[psschwei]

@psschwei is this only for the upcoming latest version or does it need to be cherrypicked to any others?

just the upcoming release, no need to cherrypick