Use CRD v1 APIs

[yuchunyu97]

Upgrade apiextensions.k8s.io/v1 with knative/serving.

See: knative/serving#8259, knative/serving#6584 and knative/serving#6582.

TODO:

• upgrade the knative/serving package

[knative-prow-robot]

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[knative-prow-robot]

Welcome @yuchunyu97! It looks like this is your first PR to knative/caching 🎉

[knative-prow-robot]

Hi @yuchunyu97. Thanks for your PR.

I'm waiting for a knative 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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[knative-prow-robot]

@yuchunyu97: PR needs rebase.

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