refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="NUnit" Version="4.4.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" Pinned="true" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.167" />
-    <PackageVersion Include="Polyfill" Version="9.4.0" />
+    <PackageVersion Include="Polyfill" Version="9.4.1" />
     <PackageVersion Include="System.Memory" Version="4.6.3" />
     <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.1.5" />
     <!-- Keep at 8 to support old frameworks -->