[release/3.1] Update dependencies from dotnet/roslyn

[dotnet-maestro]

This pull request updates the following dependencies

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

• Build: 20191112.5
• Date Produced: 11/13/2019 12:26 AM
• Commit: ff930dec4565e2bc424ad3bf3e22ecb20542c87d
• Branch: refs/heads/release/dev16.4-vs-deps
• Updates:
  • Microsoft.Net.Compilers.Toolset -> 3.4.0-beta4-19562-05

[dotnet-maestro]

Auto-Merge Status

This pull request has not been merged because Maestro++ is waiting on the following merge policies.

• ✔️ Standard Merge Policies Succeeded - Successful checks: Extensions-ci, Extensions-ci (Build Test: Linux Source Build), Extensions-ci (Build Ubuntu 16.04 Release), Extensions-ci (Build Ubuntu 16.04 Debug), Extensions-ci (Build OSX Release), Extensions-ci (Build OSX Debug), Extensions-ci (Build Windows Release), Extensions-ci (Build Windows Debug), Extensions-ci (Build Code check)
• ❌ Standard Merge Policies There are reviews that have requested changes.

[wtgodbe]

Don't merge this for GA

[dougbu]

@wtgodbe why not merge this for GA? Looks like a very minor version bump and it's coming from the correct '.NET Core 3.1 Release' channel.

[dotnet-maestro]

Auto-Merge Status

This pull request has not been merged because Maestro++ is waiting on the following merge policies.

• ✔️ Standard Merge Policies Succeeded - Successful checks: Extensions-ci, Extensions-ci (Build Test: Linux Source Build), Extensions-ci (Build Ubuntu 16.04 Release), Extensions-ci (Build Ubuntu 16.04 Debug), Extensions-ci (Build OSX Release), Extensions-ci (Build OSX Debug), Extensions-ci (Build Windows Release), Extensions-ci (Build Windows Debug), Extensions-ci (Build Code check)
• ❌ Standard Merge Policies There are reviews that have requested changes.

[wtgodbe]

@dougbu we have to "cut off" Roslyn flow at some point since the sub is set to everyBuild - I had already marked Extensions stable & didn't want to risk any more delays in GA since the build was already going slowly (and at that point we were in AspNetCore). I held this change & the corresponding one in Toolset since I wasn't aware of Roslyn getting a fix approved by tactics yesterday (for GA).

[dotnet-maestro]

Auto-Merge Status

This pull request has not been merged because Maestro++ is waiting on the following merge policies.

• ✔️ Standard Merge Policies Succeeded - Successful checks: Extensions-ci, Extensions-ci (Build Test: Linux Source Build), Extensions-ci (Build Ubuntu 16.04 Release), Extensions-ci (Build OSX Release), Extensions-ci (Build Ubuntu 16.04 Debug), Extensions-ci (Build OSX Debug), Extensions-ci (Build Windows Release), Extensions-ci (Build Code check), Extensions-ci (Build Windows Debug)
• ❌ Standard Merge Policies There are reviews that have requested changes.

[wtgodbe]

We reset GA, so we can take this