Update codecov/codecov-action action to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
codecov/codecov-action	action	major	v3 -> v4

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Release Notes

codecov/codecov-action (codecov/codecov-action)

### [`v4`](https://togithub.com/codecov/codecov-action/compare/v3...v4) [Compare Source](https://togithub.com/codecov/codecov-action/compare/v3...v4)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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Config source: https://github.com/Slamdunk/.github/blob/main/renovate-config.json

[codecov[bot]]

Codecov Report

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

Comparison is base (a181e1c) 43.37% compared to head (fa6c66c) 43.52%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #58 +/- ## ============================================ + Coverage 43.37% 43.52% +0.14% Complexity 109 109 ============================================ Files 23 23 Lines 302 301 -1 ============================================ Hits 131 131 + Misses 171 170 -1 ```

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