Bump NUnit from 3.13.3 to 4.1.0

Bumps [NUnit](https://github.com/nunit/nunit) from 3.13.3 to 4.1.0.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/master/CHANGES.md)
- [Commits](https://github.com/nunit/nunit/compare/v3.13.3...4.1.0)

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

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

WoofWare.Myriad.Plugins.Attributes/Test/WoofWare.Myriad.Plugins.Attributes.Test.fsproj

@@ -14,7 +14,7 @@
     <ItemGroup>
         <PackageReference Include="ApiSurface" Version="4.0.30" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0"/>
-        <PackageReference Include="NUnit" Version="3.13.3"/>
+        <PackageReference Include="NUnit" Version="4.1.0"/>
         <PackageReference Include="NUnit3TestAdapter" Version="4.5.0"/>
     </ItemGroup>