Bump proptest from 1.5.0 to 1.6.0 #432

Job	Run time
docs-pr	3s
spell check with typos	4s
build-on-linux (linux-kvm-debug)	1m 8s
build-on-windows (windows-debug)	38s
build-on-linux (linux-kvm-release)	1m 10s
build-on-windows (windows-release)	38s
build-on-linux (linux-hyperv-debug)	1m 10s
build-on-linux (linux-hyperv-release)	1m 13s
fuzzing / fuzz	9m 41s
rust / build (hyperv, amd, debug)	6m 17s
rust / build (hyperv, amd, release)	6m 18s
rust / build (hyperv, intel, debug)	6m 37s
rust / build (hyperv, intel, release)	6m 33s
rust / build (mshv, amd, debug)	6m 45s
rust / build (mshv, amd, release)	6m 36s
rust / build (mshv, intel, debug)	6m 51s
rust / build (mshv, intel, release)	6m 20s
rust / build (kvm, amd, debug)	7m 20s
rust / build (kvm, amd, release)	7m 14s
rust / build (kvm, intel, debug)	7m 23s
rust / build (kvm, intel, release)	7m 35s
	1h 37m 34s

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