Bump NUnit3TestAdapter (#41931)

Bumps the dotnet group in /samples/snippets/core/testing/unit-testing-using-nunit/csharp with 1 update: [NUnit3TestAdapter](https://github.com/nunit/nunit3-vs-adapter).


Updates `NUnit3TestAdapter` from 4.5.0 to 4.6.0
- [Release notes](https://github.com/nunit/nunit3-vs-adapter/releases)
- [Commits](https://github.com/nunit/nunit3-vs-adapter/compare/V4.5.0...V4.6.0)

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

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

samples/snippets/core/testing/unit-testing-using-nunit/csharp/PrimeService.Tests/PrimeService.Tests.csproj

@@ -10,7 +10,7 @@
   <!--<snippetPackages>-->
   <ItemGroup>
     <PackageReference Include="nunit" Version="4.1.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.2.0">
         <PrivateAssets>all</PrivateAssets>