bump go lib to 1.21

[xiangjingli]

• I have taken backward compatibility into consideration.

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.97%. Comparing base (62440e4) to head (23c322c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   73.02%   72.97%   -0.05%     
==========================================
  Files          14       14              
  Lines        2769     2779      +10     
==========================================
+ Hits         2022     2028       +6     
- Misses        606      609       +3     
- Partials      141      142       +1     

Flag	Coverage Δ
unit	72.97% <ø> (-0.05%)	⬇️

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