refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -9,9 +9,9 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="NUnit" Version="4.3.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />
-    <PackageVersion Include="Polyfill" Version="7.7.0" />
+    <PackageVersion Include="Polyfill" Version="7.7.1" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.147" />
     <PackageVersion Include="Verify" Version="28.6.0" />
-    <PackageVersion Include="Verify.Nunit" Version="28.5.0" />
+    <PackageVersion Include="Verify.Nunit" Version="28.6.0" />
   </ItemGroup>
 </Project>