refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -22,7 +22,7 @@
     <PackageVersion Include="System.Data.SqlClient" Version="4.9.0" />
     <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" />
     <PackageVersion Include="Verify.SqlServer" Version="10.1.0" />
   </ItemGroup>
 </Project>