Fix workflow warning

[martincostello]

Remove deprecated file input for codecov/codecov-action.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.50%. Comparing base (b3134ed) to head (e94c73c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1582      +/-   ##
==========================================
- Coverage   78.61%   78.50%   -0.12%     
==========================================
  Files         141      141              
  Lines        3550     3550              
  Branches      501      501              
==========================================
- Hits         2791     2787       -4     
- Misses        511      515       +4     
  Partials      248      248              

Flag	Coverage Δ
linux	78.45% <ø> (-0.17%)	⬇️
macos	47.40% <ø> (+0.05%)	⬆️
windows	47.35% <ø> (ø)

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