bump: bump up golang version to v1.21

[Two-Hearts]

Resolves #191

[github-advanced-security]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.88%. Comparing base (2bc927b) to head (1f2751b).
Report is 4 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #194      +/-   ##
==========================================
+ Coverage   89.32%   89.88%   +0.55%     
==========================================
  Files          21       23       +2     
  Lines        1724     1592     -132     
==========================================
- Hits         1540     1431     -109     
+ Misses        149      120      -29     
- Partials       35       41       +6     

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[shizhMSFT]

LGTM

[priteshbandi]

LGTM

[JeyJeyGao]

LGTM