refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="GraphQL" Version="8.5.0" />
     <PackageVersion Include="GraphQL.MicrosoftDI" Version="8.5.0" />
     <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.Http" Version="2.3.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.4" />
     <PackageVersion Include="Microsoft.Data.SqlClient" Version="6.0.2" />