refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.5" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.0.3" />
-    <PackageVersion Include="Polyfill" Version="8.0.0-beta.2" />
+    <PackageVersion Include="Polyfill" Version="8.0.0-beta.4" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.155" />
     <PackageVersion Include="System.Text.Encodings.Web" Version="9.0.0" />
     <PackageVersion Include="Verify.SqlServer" Version="11.1.1" />