refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -7,7 +7,7 @@
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageVersion Include="NServiceBus" Version="9.2.7" />
-    <PackageVersion Include="Polyfill" Version="7.30.0" />
+    <PackageVersion Include="Polyfill" Version="7.31.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.152" />
     <PackageVersion Include="Verify" Version="30.0.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />