[release/6.0.1xx-preview5] Update dependencies from dotnet/roslyn

[dotnet-maestro]

This pull request updates the following dependencies

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

• Subscription: 36d72a60-4138-4c9e-24d5-08d9158524d7
• Build: 20210603.3
• Date Produced: 6/3/2021 6:25 PM
• Commit: 5dc3c06726b564dade27edac0236b93fe6babb25
• Branch: refs/heads/release/dev17.0-preview1-vs-deps

• Updates:
  • Microsoft.CodeAnalysis.CSharp.Features: from 4.0.0-1.21277.15 to 4.0.0-1.21303.3
  • Microsoft.CodeAnalysis.CSharp: from 4.0.0-1.21277.15 to 4.0.0-1.21303.3
  • Microsoft.Net.Compilers.Toolset: from 4.0.0-1.21277.15 to 4.0.0-1.21303.3
  • Microsoft.CodeAnalysis.Workspaces.MSBuild: from 4.0.0-1.21277.15 to 4.0.0-1.21303.3

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[dotnet-maestro]

Notification for subscribed users from https://github.com/dotnet/roslyn:

@roslyn-infrastructure

Action requested: Please take a look at this failing automated dependency-flow pull request's checks; failures may be related to changes which originated in your repo.

• This pull request contains changes from your source repo (https://github.com/dotnet/roslyn) and seems to have failed checks in this PR. Please take a peek at the failures and comment if they seem relevant to your changes.
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• For more details, please read the Arcade Darc documentation

[v-wuzhai]

@sfoslund @mmitche This build analysis leg is blocking some PRs (such as #18051, #18046, #18042, #18041, #18036). Could you help to take a look?

[mmitche]

@ChadNedzlek @missymessa @AlitzelMendez