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://redirect.github.com/codecov/codecov-action/compare/v3...v4) [Compare Source](https://redirect.github.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 is behind base branch, 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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This PR was generated by Mend Renovate. View the repository job log.

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (9234d1b) to head (009f361).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #225 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 8 8 Lines 401 401 Branches 76 76 ========================================= Hits 401 401 ```

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