Update k8s registry references

[asa3311]

Ⅰ. Describe what this PR does

Per kubernetes/k8s.io#4780, Kubernetes is migrating its image registry to registry.k8s.io, and this repository is impacted.

We have to update the references of k8s.gcr.io to registry.k8s.io by April 3rd to remain up-to-date.

Here's a quick search for k8s.gcr.io on this repo. [search result]. Note that there may be other valid references (like, in the form of generated code, etc) which we have to be aware of.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #1208 (ca28cd9) into master (6115b9c) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master    #1208   +/-   ##
=======================================
  Coverage   50.04%   50.04%           
=======================================
  Files         143      143           
  Lines       19906    19906           
=======================================
  Hits         9962     9962           
  Misses       8849     8849           
  Partials     1095     1095           

Flag	Coverage Δ
unittests	50.04% <ø> (ø)

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[furykerry]

/lgtm

[zmberg]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zmberg

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