chore: bump NUnit (#2254)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

openfeature/provider_tests/dotnet-integration-tests/ProviderTests/ProviderTests.csproj

@@ -12,7 +12,7 @@
     <ItemGroup>
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
-        <PackageReference Include="NUnit" Version="4.1.0" />
+        <PackageReference Include="NUnit" Version="4.2.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
         <PackageReference Include="NUnit.Analyzers" Version="4.3.0" />
         <PackageReference Include="coverlet.collector" Version="6.0.2" />