[Fix] ch20596 update k8s version to 1.21

[kentwelcome]

Signed-off-by: Kent Huang kentwelcome@gmail.com

PR checklist

• [x] Ensure you have added or ran the appropriate tests for your PR.
• [x] DCO signed

What type of PR is this? CI/CD fix

What this PR does / why we need it: Fix build VM failed issue

Which issue(s) this PR fixes: ch20596

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov[bot]]

Codecov Report

Merging #503 (df4eb72) into master (26c830e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #503   +/-   ##
=======================================
  Coverage   77.21%   77.21%           
=======================================
  Files           8        8           
  Lines        1624     1624           
=======================================
  Hits         1254     1254           
  Misses        370      370           

Flag	Coverage Δ
unittests	77.21% <ø> (ø)

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