Reference VS protocol from workspaces (because it's not transitively brought in by Roslyn any more)

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/Microsoft.CodeAnalysis.Razor.Workspaces.csproj

@@ -20,6 +20,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="$(MicrosoftCodeAnalysisWorkspacesCommonPackageVersion)" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="$(MicrosoftExtensionsPackageVersion)" />
     <PackageReference Include="Microsoft.Extensions.NonCapturingTimer.Sources" Version="$(MicrosoftExtensionsNonCapturingTimerSourcesPackageVersion)" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.VisualStudio.LanguageServer.Protocol" Version="$(MicrosoftVisualStudioLanguageServerProtocolPackageVersion)" />
     <PackageReference Include="System.Composition.AttributedModel" Version="$(SystemCompositionPackageVersion)" />
   </ItemGroup>