Update `codecov-action@v3` to `v4`

[drbenvincent]

• Closes #348

[codecov[bot]]

Codecov Report

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

Project coverage is 79.98%. Comparing base (1b5c166) to head (92d0031).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #349 +/- ## ======================================= Coverage 79.98% 79.98% ======================================= Files 21 21 Lines 1634 1634 ======================================= Hits 1307 1307 Misses 327 327 ```

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