chore: Bump deepcopy-gen

[rquitales]

This commit bumps geepcopy-gen to v0.25.3 to match upstream Kubernetes K8s resources when generating deepcopy methods.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @rquitales. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ash2k]

I suppose this needs to go together with #606

[rquitales]

Yes, this PR was drafted for another pending PR, but it'll just be merged in with #606 instead.