refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="GraphQL.Server.Transports.AspNetCore" Version="8.2.0" />
     <PackageVersion Include="GraphQL.Server.Ui.GraphiQL" Version="8.2.0" />
     <PackageVersion Include="GraphQL.SystemTextJson" Version="8.5.0" />
-    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
+    <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.0-beta.1" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.4" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.4" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />