Updating to libClangSharp v21.1.8.1 #541

Job	Run time
linux-arm64 (arm64, release, ubuntu)	3m 29s
windows-x64 (x64, release, windows)	5m 12s
linux-x64 (x64, debug, ubuntu)	3m 36s
macos-arm64 (arm64, debug, macos)	4m 56s
linux-x64 (x64, release, ubuntu)	3m 31s
windows-arm64 (arm64, debug, windows)	7m 22s
windows-arm64 (arm64, release, windows)	5m 44s
windows-x64 (x64, debug, windows)	5m 27s
macos-arm64 (arm64, release, macos)	3m 41s
linux-arm64 (arm64, debug, ubuntu)	3m 31s
publish-nightlies-azure	-1s
sign-nuget	-1s
publish-nightlies-github	-1s
	46m 26s

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