chore: migrate from k8s.gcr.io to registry.k8s.io

[ahmedwaleedmalik]

Fixes #

Proposed Changes

Kubernetes is migrating its image registry from k8s.gcr.io to registry.k8s.io.

Part of kubernetes/k8s.io#4780.

Release Note

NONE

Docs

xref knative/operator#1342

[knative-prow]

Welcome @ahmedwaleedmalik! It looks like this is your first PR to knative-sandbox/sample-source 🎉

[knative-prow]

Hi @ahmedwaleedmalik. Thanks for your PR.

I'm waiting for a knative-sandbox 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ahmedwaleedmalik]

@lberk can you PTAL?

[ahmedwaleedmalik]

@gab-satchi can you PTAL?

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmedwaleedmalik, pierDipi

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