fix: correct file parameter to files in Codecov action for proper result upload

[daizutabi]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.42%. Comparing base (e85f44c) to head (b188438).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
+ Coverage   96.32%   96.42%   +0.09%     
==========================================
  Files           6        6              
  Lines        1006     1006              
==========================================
+ Hits          969      970       +1     
+ Misses         37       36       -1     

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