zerocopy: move repo to zerocopy 0.8 #1777

Job	Run time
build and check docs [x64-windows]	10m 2s
build openhcl [aarch64-linux]	5m 28s
build mdbook guide	2m 24s
build artifacts [x64-linux]	6m 16s
clippy [windows], unit tests [x64-windows]	4m 56s
build openhcl [x64-linux]	7m 51s
clippy [linux-musl, misc nostd], unit tests [x64-linux-musl]	3m 10s
clippy [linux, macos], unit tests [x64-linux]	3m 22s
unit tests [aarch64-windows]	7m 19s
build and check docs [x64-linux]	2m 44s
test flowey local backend	3m 5s
xtask fmt (linux)	2m 23s
build artifacts (not for VMM tests) [aarch64-windows]	5m 18s
build artifacts (for VMM tests) [aarch64-windows]	9m 47s
build artifacts (not for VMM tests) [x64-windows]	6m 10s
build artifacts (for VMM tests) [x64-windows]	9m 28s
build artifacts [aarch64-linux]	5m 19s
xtask fmt (windows)	7m 55s
run vmm-tests [x64-linux]	3m 38s
run vmm-tests [x64-windows-amd]	12m 32s
run vmm-tests [x64-windows-intel]	10m 49s
run vmm-tests [aarch64-windows]	5m 37s
openvmm checkin gates	6s
	2h 15m 39s

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