[release/5.0.1xx-preview8] Update dependencies from dotnet/roslyn

[dotnet-maestro]

This pull request updates the following dependencies

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

• Subscription: e251dd77-ab9f-49fc-4299-08d828bd4fbd
• Build: 20200717.11
• Date Produced: 7/17/2020 8:57 PM
• Commit: fb7b2e716d163b7abebf57db505e01a4a521ddae
• Branch: refs/heads/master-vs-deps
• Updates:
  • Microsoft.Net.Compilers.Toolset: from 3.7.0-5.20365.2 to 3.8.0-1.20367.11

[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-sdk-public-ci, dotnet-sdk-public-ci (Build Ubuntu_16_04 Build_Release), dotnet-sdk-public-ci (Build Darwin Build_Release), dotnet-sdk-public-ci (Build Ubuntu_16_04 Build_Debug), dotnet-sdk-public-ci (Build Darwin Build_Debug), dotnet-sdk-public-ci (Build Windows_NT_TestAsTools Build_Debug), dotnet-sdk-public-ci (Build Windows_NT_FullFramework Build_Release), dotnet-sdk-public-ci (Build Windows_NT_FullFramework Build_Debug), dotnet-sdk-public-ci (Build Windows_NT Build_Release), dotnet-sdk-public-ci (Build Windows_NT Build_Debug)
• ✔️ Standard Merge Policies Succeeded - No reviews have requested changes.
• ✔️ Standard Merge Policies Succeeded - No version downgrade detected.