Update dependency Microsoft.CodeDom.Providers.DotNetCompilerPlatform to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.CodeDom.Providers.DotNetCompilerPlatform	2.0.1 -> 4.1.0

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Release Notes

aspnet/RoslynCodeDomProvider (Microsoft.CodeDom.Providers.DotNetCompilerPlatform)

v3.6.0: release

Several bug fixes. Some more prominent changes:

• Update to 3.6 .Net compilers... in particular enabling C# 7.3 for .Net projects using this package.
• Config de/hydration feature so changes to compiler config are not lost when upgrading this package.
• Ability to turn off auto-enabled compiler arguments that exist for ASP.Net scenarios.
• Shift to for configuring the CodeDom provider instead of global appSettings switches.
• Fix bugs in .Net Core MSBuild scenario.

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Configuration

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