update to libssh 0.11.0 #135

Job	Run time
build_linux_cmake (Release, Unix Makefiles)	16m 51s
build_linux (64)	15m 47s
build_linux_cmake (Debug, Unix Makefiles)	16m 8s
build_windows (Release, x64)	12m 14s
build_linux (32)	9m 36s
build_windows (Release, ARM64)	14m 24s
build_windows (Release, Win32)	12m 44s
build_windows (Debug, x64)	13m 50s
build_windows (Debug, ARM64)	14m 1s
build_windows (Debug, Win32)	14m 11s
	2h 19m 46s

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