Bump Microsoft.CodeAnalysis.CSharp.Workspaces (#997)

Bumps [Microsoft.CodeAnalysis.CSharp.Workspaces](https://github.com/dotnet/roslyn) from 4.0.0-2.final to 4.2.0.
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/main/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits/v4.2.0)

---
updated-dependencies:
- dependency-name: Microsoft.CodeAnalysis.CSharp.Workspaces
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

Directory.Packages.props

@@ -11,7 +11,7 @@
         <PackageVersion Include="Microsoft.Build.Locator" Version="1.4.1"/>
         <PackageVersion Include="Microsoft.Extensions.FileSystemGlobbing" Version="6.0.0-preview.6.21352.12"/>
         <PackageVersion Include="Microsoft.Build.Framework" Version="16.10.0"/>
-        <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.0.0-2.final"/>
+        <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.2.0"/>
         <PackageVersion Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.0.0-2.final"/>
         <PackageVersion Include="System.CommandLine" Version="2.0.0-beta1.21308.1"/>
         <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All"/>