Remove Microsoft.CSharp nuget dependency

[Romfos]

Microsoft.CSharp alreary included in .NET Core and no need to add it as nuget pacakge

[Romfos]

@Romfos please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

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[lbargaoanu]

Thanks! 13.0 is already out...

[github-actions]

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