nuget: bump Microsoft.CodeAnalysis.CSharp from 4.9.2 to 4.11.0 #7

Job	Run time
format	3m 10s
pr_build / win-x64 (Debug)	8m 50s
pr_build / macOS Universal (Debug)	5m 56s
pr_build / linux-x64 (Debug)	5m 9s
pr_build / macOS Universal (Release)	5m 49s
pr_build / linux-arm64 (Debug)	2m 57s
pr_build / osx-x64 (Debug)	5m 33s
pr_build / win-x64 (Release)	8m 35s
pr_build / linux-x64 (Release)	4m 31s
pr_build / linux-arm64 (Release)	3m 8s
pr_build / osx-x64 (Release)	3m 50s
	57m 28s

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