build: bump minimal required go version to 1.21

[Chenxulin97]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.30%. Comparing base (47373a5) to head (9f8ef2c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   70.30%   70.30%           
=======================================
  Files          40       40           
  Lines        1364     1364           
=======================================
  Hits          959      959           
  Misses        336      336           
  Partials       69       69           

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