Bump NUnit from 4.3.0 to 4.3.1 (#66)

Bumps [NUnit](https://github.com/nunit/nunit) from 4.3.0 to 4.3.1.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@4.3.0...4.3.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Directory.Packages.props

@@ -12,7 +12,7 @@
         <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0"/>
         <PackageVersion Include="NSubstitute" Version="5.3.0"/>
         <PackageVersion Include="NSubstitute.Analyzers.CSharp" Version="1.0.17"/>
-        <PackageVersion Include="NUnit" Version="4.3.0"/>
+        <PackageVersion Include="NUnit" Version="4.3.1"/>
         <PackageVersion Include="NUnit.Analyzers" Version="4.4.0"/>
         <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0"/>
         <PackageVersion Include="NuGet.Protocol" Version="6.12.1"/>