chore: bump NUnit

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] <[email protected]>

Author: dependabot[bot]

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

@@ -12,7 +12,7 @@
     <ItemGroup>
         <PackageReference Include="FluentAssertions" Version="7.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-        <PackageReference Include="NUnit" Version="4.3.0" />
+        <PackageReference Include="NUnit" Version="4.3.1" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
         <PackageReference Include="NUnit.Analyzers" Version="4.4.0" />
         <PackageReference Include="coverlet.collector" Version="6.0.2" />