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 83.82%. Comparing base (d06fb91) to head (a904edd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #792      +/-   ##
==========================================
+ Coverage   83.38%   83.82%   +0.44%     
==========================================
  Files          28       28              
  Lines         674      674              
  Branches      151      151              
==========================================
+ Hits          562      565       +3     
+ Misses         68       67       -1     
+ Partials       44       42       -2     

Flag	Coverage Δ
linux	82.78% <ø> (+0.44%)	⬆️
macos	83.53% <ø> (+0.89%)	⬆️
windows	82.78% <ø> (ø)

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