[RELEASE-1.11] Move to go 1.21

[skonto]

• Aligning stuff as in Bump golang version to 1.21 serverless-operator#2451

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8d47024) 81.36% compared to head (9e2cbc1) 81.36%.

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Additional details and impacted files

@@              Coverage Diff               @@
##           release-v1.11      #72   +/-   ##
==============================================
  Coverage          81.36%   81.36%           
==============================================
  Files                 18       18           
  Lines               1594     1594           
==============================================
  Hits                1297     1297           
  Misses               213      213           
  Partials              84       84           

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[ReToCode]

/lgtm
/approve

[openshift-ci]

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