Update for codecov v5

[graeme-a-stewart]

There was a change in the configuration from "file" to "files", so this corrects the action

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.22%. Comparing base (01490c0) to head (7dae176).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #214   +/-   ##
=======================================
  Coverage   80.22%   80.22%           
=======================================
  Files          21       21           
  Lines        1315     1315           
=======================================
  Hits         1055     1055           
  Misses        260      260           

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[m-fila]

I never noticed, but indeed there was a warning in job summary

[graeme-a-stewart]

Yeah, it seemed to be a "mostly harmless" mistake, but better to fix it!