refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="NUnit" Version="4.6.1" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.2.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.174" />
-    <PackageVersion Include="Polyfill" Version="10.7.1" />
+    <PackageVersion Include="Polyfill" Version="10.8.0" />
     <PackageVersion Include="ProjectFiles" Version="1.2.0" />
     <PackageVersion Include="Verify" Version="31.19.0" />
     <PackageVersion Include="Verify.NUnit" Version="31.19.0" />