refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />
     <PackageVersion Include="Polyfill" Version="7.12.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.147" />
-    <PackageVersion Include="Verify" Version="29.0.0" />
-    <PackageVersion Include="Verify.NUnit" Version="29.0.0" />
+    <PackageVersion Include="Verify" Version="28.9.0" />
+    <PackageVersion Include="Verify.NUnit" Version="28.9.0" />
   </ItemGroup>
 </Project>