promote kep-3762 to beta

[carlory]

• One-line PR description: promote kep-3762 to beta

• Issue link: PersistentVolume last phase transition time #3762

• Other comments:

[carlory]

/cc @wojtek-t @RomanBednar

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carlory
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[RomanBednar]

PR for updating the KEP and beta graduation is already here: #4125

Please close this one.

[carlory]

/close

[k8s-ci-robot]

@carlory: Closed this PR.

In response to this:

/close

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