refs and cleanup

Author: SimonCropp

src/Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.0.2" />
     <PackageVersion Include="Microsoft.Data.SqlClient" Version="7.0.0" />
     <PackageVersion Include="Microsoft.Extensions.DiagnosticAdapter" Version="3.1.32" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
     <PackageVersion Include="Microsoft.SqlServer.TransactSql.ScriptDom" Version="170.191.0" />
     <PackageVersion Include="Microsoft.SqlServer.SqlManagementObjects" Version="181.15.0" />
     <PackageVersion Include="NUnit" Version="4.5.1" />