refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -23,7 +23,7 @@
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.8" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
     <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.1.5" />
-    <PackageVersion Include="Polyfill" Version="10.7.1" />
+    <PackageVersion Include="Polyfill" Version="10.8.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.174" />
     <PackageVersion Include="System.Text.Encodings.Web" Version="10.0.8" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.2.0" />