Update dependency NUnit to v4.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
NUnit (source)	4.1.0 -> 4.2.1

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Release Notes

nunit/nunit (NUnit)

### [`v4.2.1`](https://togithub.com/nunit/nunit/compare/4.2.0...4.2.1) [Compare Source](https://togithub.com/nunit/nunit/compare/4.2.0...4.2.1) ### [`v4.2.0`](https://togithub.com/nunit/nunit/compare/4.1.0...4.2.0) [Compare Source](https://togithub.com/nunit/nunit/compare/4.1.0...4.2.0)

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Configuration

📅 Schedule: Branch creation - "before 9am on Friday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ 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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[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (10eba5e) to head (a65e4e7). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #157 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 7 7 Lines 112 112 Branches 13 13 ========================================= Hits 112 112 ```

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