refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Magick.NET-Q16-AnyCPU" Version="14.11.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
     <PackageVersion Include="NUnit" Version="4.5.1" />
-    <PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" Pinned="true" />
+    <PackageVersion Include="NUnit3TestAdapter" Version="6.2.0" />
     <PackageVersion Include="Polyfill" Version="9.22.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.172" />
     <PackageVersion Include="Verify" Version="31.13.5" />