Bump NUnit from 3.14.0 to 4.1.0 in /C#

Bumps [NUnit](https:/nunit/nunit) from 3.14.0 to 4.1.0.
- [Release notes](https:/nunit/nunit/releases)
- [Changelog](https:/nunit/nunit/blob/master/CHANGES.md)
- [Commits](nunit/nunit@v3.14.0...4.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

C#/TestPalindrome/TestPalindrome.csproj

@@ -12,7 +12,7 @@
  <ItemGroup>
  <PackageReference Include="coverlet.collector" Version="6.0.0" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
- <PackageReference Include="NUnit" Version="3.14.0" />
+ <PackageReference Include="NUnit" Version="4.1.0" />
  <PackageReference Include="NUnit.Analyzers" Version="3.9.0" />
  <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
  </ItemGroup>