go version to 1.21

[haorenfsa]

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[haorenfsa]

fix milvus-io/milvus#35142

[zwd1208]

/lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.79%. Comparing base (42d2415) to head (405db98).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #164   +/-   ##
=======================================
  Coverage   81.79%   81.79%           
=======================================
  Files          56       56           
  Lines        5137     5137           
=======================================
  Hits         4202     4202           
  Misses        744      744           
  Partials      191      191           

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