Bump NUnit from 4.1.0 to 4.2.0 in /WellKnownDataTypes-Tests

Bumps [NUnit](https://github.com/nunit/nunit) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@4.1.0...4.2.0)

---
updated-dependencies:
- dependency-name: NUnit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

WellKnownDataTypes-Tests/WellKnownDataTypes-Tests.csproj

@@ -13,7 +13,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-		<PackageReference Include="NUnit" Version="4.1.0" />
+		<PackageReference Include="NUnit" Version="4.2.0" />
 		<PackageReference Include="NUnit.Analyzers" Version="4.2.0">
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>