refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -17,7 +17,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="NUnit" Version="4.2.2" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />
-    <PackageVersion Include="Polyfill" Version="7.4.1" />
+    <PackageVersion Include="Polyfill" Version="7.5.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.144" />
     <PackageVersion Include="System.Data.SqlClient" Version="4.9.0" />
     <PackageVersion Include="Verify" Version="28.2.1" />