Remove testmod task

[goccy]

SSIA

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.92%. Comparing base (82ba1ba) to head (f74bb46).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #715   +/-   ##
=======================================
  Coverage   77.92%   77.92%           
=======================================
  Files          22       22           
  Lines        7963     7963           
=======================================
  Hits         6205     6205           
  Misses       1346     1346           
  Partials      412      412           

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