Bump NUnit3TestAdapter from 6.0.1 to 6.1.0 (#238)

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/Avalonia.Samples/Testing/TestableApp.Headless.NUnit/TestableApp.Headless.NUnit.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="Avalonia.Headless.NUnit" Version="11.3.10" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageReference Include="NUnit" Version="4.4.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="6.0.1" />
+    <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.11.2" />
     <PackageReference Include="coverlet.collector" Version="6.0.4" />
   </ItemGroup>