[automated] Merge branch 'release/3.0' => 'release/3.1' (#26170)

[automated] Merge branch 'release/3.0' => 'release/3.1' (#26170)

* [release/3.0] Update dependencies from dotnet/arcade (#26143)

* Update dependencies from https://github.com/dotnet/arcade build 20190812.1

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19412.1
- Microsoft.DotNet.Build.Tasks.Feed - 2.2.0-beta.19412.1
- Microsoft.DotNet.Build.Tasks.Packaging - 1.0.0-beta.19412.1
- Microsoft.DotNet.Helix.Sdk - 2.0.0-beta.19412.1

* Update dependencies from https://github.com/dotnet/arcade build 20190812.7

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19412.7
- Microsoft.DotNet.Build.Tasks.Feed - 2.2.0-beta.19412.7
- Microsoft.DotNet.Build.Tasks.Packaging - 1.0.0-beta.19412.7
- Microsoft.DotNet.Helix.Sdk - 2.0.0-beta.19412.7

* Update dependencies from https://github.com/dotnet/core-setup build 20190807.10 (#26074)

- Microsoft.NETCore.App - 3.0.0-preview9-19407-10