refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -5,10 +5,10 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="Argon" Version="0.33.0" />
-    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.11" />
+    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.24" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="10.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageVersion Include="Polyfill" Version="9.7.3" />
+    <PackageVersion Include="Polyfill" Version="9.7.6" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.170" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
     <PackageVersion Include="Verify.XunitV3" Version="31.9.4" />