[master] Update dependencies from dotnet/arcade

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/dotnet/arcade

• Build: 20190919.8
• Date Produced: 9/19/2019 10:34 PM
• Commit: 67f02d61a4bff11930c10fb03f77bb4f93a37690
• Branch: refs/heads/master
• Updates:
  • Microsoft.DotNet.VersionTools.Tasks -> 5.0.0-beta.19469.8
  • Microsoft.DotNet.Arcade.Sdk -> 5.0.0-beta.19469.8
  • Microsoft.DotNet.Build.Tasks.Feed -> 5.0.0-beta.19469.8
  • Microsoft.DotNet.Build.Tasks.Packaging -> 5.0.0-beta.19469.8

[dagood]

Pushed manual fix for dotnet/arcade#3938 to get the internal servicing fixes in eng/common for dotnet/arcade#3868.

[dotnet-maestro]

Auto-Merge Status

This pull request has been merged because the following merge policies have succeeded.

• ✔️ Standard Merge Policies Succeeded - Successful checks: dotnet.core-setup, dotnet.core-setup (Build Windows_x86 release), dotnet.core-setup (Build Windows_x86 debug), dotnet.core-setup (Build Windows_x64 release), dotnet.core-setup (Build Windows_Arm64 release), dotnet.core-setup (Build Windows_x64 debug), dotnet.core-setup (Build Windows_Arm64 debug), dotnet.core-setup (Build Windows_Arm release), dotnet.core-setup (Build Windows_Arm debug), dotnet.core-setup (Build OSX release), dotnet.core-setup (Build OSX debug), dotnet.core-setup (Build Linux_x64_Rhel6 release), dotnet.core-setup (Build Linux_x64_Rhel6 debug), dotnet.core-setup (Build Linux_x64_glibc release), dotnet.core-setup (Build Linux_x64_glibc debug), dotnet.core-setup (Build Linux_x64_Alpine36 release), dotnet.core-setup (Build Linux_x64_Alpine36 debug), dotnet.core-setup (Build Linux_Arm64_Alpine37 release), dotnet.core-setup (Build Linux_Arm64_Alpine37 debug), dotnet.core-setup (Build Linux_Arm64 release), dotnet.core-setup (Build Linux_Arm64 debug), dotnet.core-setup (Build Linux_Arm release), dotnet.core-setup (Build Linux_Arm debug)
• ✔️ Standard Merge Policies Succeeded - No reviews have requested changes.