refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.8" />
     <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.1.4" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageVersion Include="Polyfill" Version="9.3.2" />
+    <PackageVersion Include="Polyfill" Version="9.3.4" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.163" />
     <PackageVersion Include="Resourcer.Fody" Version="1.8.1" />
     <PackageVersion Include="Serilog" Version="4.3.0" />