fix: use go.mod version in CI

[huykn]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR replaces the hard-coded Go version in the CI workflow with go.mod as the toolchain source.

Technical Notes: actions/setup-go will now track the repository's go directive, preventing CI from drifting from the module's declared Go version.

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[augmentcode]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.90%. Comparing base (afc94ff) to head (86b46f5).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage   93.90%   93.90%           
=======================================
  Files           8        8           
  Lines         476      476           
=======================================
  Hits          447      447           
  Misses         17       17           
  Partials       12       12           

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