file -> files in codecov ci

[blegat]

There was a change in the API that require an s to be added, dependabot doesn't do that automatically and there is a warning appearing in ci

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.73%. Comparing base (e395b28) to head (0d4c874).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #350   +/-   ##
=======================================
  Coverage   90.73%   90.73%           
=======================================
  Files          16       16           
  Lines        2300     2300           
=======================================
  Hits         2087     2087           
  Misses        213      213           

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