Update codecov/codecov-action to v4

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.59%. Comparing base (dfe6e7c) to head (851537a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #819 +/- ## ======================================= Coverage 95.59% 95.59% ======================================= Files 2 2 Lines 477 477 Branches 96 96 ======================================= Hits 456 456 Misses 12 12 Partials 9 9 ```

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