refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -12,6 +12,6 @@
     <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.6" />
     <PackageVersion Include="Verify" Version="28.6.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
-    <PackageVersion Include="Verify.Nunit" Version="28.5.0" />
+    <PackageVersion Include="Verify.Nunit" Version="28.6.0" />
   </ItemGroup>
 </Project>