⬆️ Update actions/checkout action to v4.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	patch	v4.2.0 -> v4.2.1

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Release Notes

actions/checkout (actions/checkout)

### [`v4.2.1`](https://redirect.github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v421) [Compare Source](https://redirect.github.com/actions/checkout/compare/v4.2.0...v4.2.1) - Check out other refs/\* by commit if provided, fall back to ref by [@​orhantoy](https://redirect.github.com/orhantoy) in [https://github.com/actions/checkout/pull/1924](https://redirect.github.com/actions/checkout/pull/1924)

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Configuration

📅 Schedule: Branch creation - "before 2am" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ 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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[codecov[bot]]

Codecov Report

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

Project coverage is 97.84%. Comparing base (a54d635) to head (81b089a). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #321 +/- ## ======================================= Coverage 97.84% 97.84% ======================================= Files 34 34 Lines 1484 1484 Branches 197 197 ======================================= Hits 1452 1452 Misses 18 18 Partials 14 14 ```

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