Update dependency NUnit to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
NUnit (source)	3.13.3 -> 4.1.0

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Release Notes

nunit/nunit (NUnit)

### [`v4.1.0`](https://togithub.com/nunit/nunit/releases/tag/4.1.0): NUnit 4.1.0 See [release notes](https://docs.nunit.org/articles/nunit/release-notes/framework.html#nunit-41---february-23-2024) ### [`v4.0.1`](https://togithub.com/nunit/nunit/releases/tag/v4.0.1): NUnit 4.0.1 Patch release to fix windows targets See [release notes](https://docs.nunit.org/articles/nunit/release-notes/framework.html#nunit-401---december-2-2023) and See [migration guide](https://docs.nunit.org/articles/nunit/release-notes/Nunit4.0-MigrationGuide.html) ### [`v4.0.0`](https://togithub.com/nunit/nunit/blob/HEAD/CHANGES.md#NUnit-400---November-26-2023) All changes, see [release notes](https://docs.nunit.org/articles/nunit/release-notes/framework.html#nunit-400) ### [`v3.14.0`](https://togithub.com/nunit/nunit/releases/tag/v3.14.0): NUnit 3.14.0 See [release notes](https://docs.nunit.org/articles/nunit/release-notes/framework.html)

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