Update buddy_system_allocator requirement from 0.9.0 to 0.11.0 #17

Job	Run time
build-on-windows (windows-debug)	46s
build-on-windows (windows-release)	57s
build-on-linux (linux-kvm-debug)	51s
build-on-linux (linux-kvm-release)	1m 0s
build-on-linux (linux-hyperv-debug)	58s
build-on-linux (linux-hyperv-release)	59s
fuzzing / fuzz	9m 47s
rust / build (windows-2022-debug)	16m 15s
rust / build (linux-kvm-debug)	9m 44s
rust / build (linux-hyperv-debug)	9m 48s
rust / build (windows-2022-release)	20m 56s
rust / build (linux-kvm-release)	13m 48s
rust / build (linux-hyperv-release)	14m 3s
	1h 39m 52s

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