Bumps [Microsoft.CodeAnalysis.CSharp.Scripting](https://github.com/dotnet/roslyn) from 3.8.0 to 3.9.0.
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/master/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/compare/v3.8.0...v3.9.0)
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