nuget: bump Microsoft.CodeAnalysis.CSharp from 4.9.2 to 4.11.0 #5

Job	Run time
format	3m 6s
pr_build / macOS Universal (Debug)	6m 5s
pr_build / win-x64 (Debug)	10m 1s
pr_build / macOS Universal (Release)	5m 43s
pr_build / linux-x64 (Debug)	5m 16s
pr_build / linux-arm64 (Debug)	3m 6s
pr_build / osx-x64 (Debug)	5m 36s
pr_build / win-x64 (Release)	8m 5s
pr_build / linux-x64 (Release)	4m 37s
pr_build / linux-arm64 (Release)	2m 59s
pr_build / osx-x64 (Release)	6m 58s
	1h 1m 32s

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