Bump NUnit from 3.13.0 to 3.13.1

Bumps [NUnit](https://github.com/nunit/nunit) from 3.13.0 to 3.13.1.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/master/CHANGES.md)
- [Commits](nunit/nunit@v3.13...v3.13.1)

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

Author: dependabot[bot]

Tests/Tests.csproj

@@ -10,7 +10,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
-    <PackageReference Include="NUnit" Version="3.13.0" />
+    <PackageReference Include="NUnit" Version="3.13.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.17.0"><IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 <PrivateAssets>all</PrivateAssets>
 </PackageReference>