Update versions .props based on the RC2 build

Author: marcpopMSFT

NuGet.config

@@ -4,7 +4,6 @@
  <clear />
  <!--Begin: Package sources managed by Dependency Flow automation. Do not edit the sources below.-->
  <!-- Begin: Package sources from dotnet-dotnet -->
- <add key="darc-pub-dotnet-dotnet-79c85d9" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-dotnet-79c85d96/nuget/v3/index.json" />
  <!-- End: Package sources from dotnet-dotnet -->
  <!-- Begin: Package sources from microsoft-testfx -->
  <!-- End: Package sources from microsoft-testfx -->