fix ci go version, milvus default to 2.4.21, bump version

[haorenfsa]

fix #239
/cc @LoveEachDay

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.58%. Comparing base (4e34fe9) to head (c71e53f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #240   +/-   ##
=======================================
  Coverage   80.58%   80.58%           
=======================================
  Files          56       56           
  Lines        6275     6275           
=======================================
  Hits         5057     5057           
  Misses       1027     1027           
  Partials      191      191           

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