[msbuild] Bump to track xplat-master and update roslyn (#16155)

[mono-project.git] / global.json

{
  "tools": {
    "dotnet": "5.0.100-alpha1-013628"
  },
  "msbuild-sdks": {
    "Microsoft.DotNet.Arcade.Sdk": "1.0.0-beta.19379.1",
    "Microsoft.DotNet.Helix.Sdk": "2.0.0-beta.19379.1"
  }
}