Implement Sync for ArrayParts (#1552) #563

Job	Run time
format/nightly	16s
nostd/thumbv6m-none-eabi/stable	18s
miri	10m 45s
docs/nightly	22s
cross_test/s390x-unknown-linux-gnu/stable	7m 39s
cargo-careful	2m 12s
cross_test/i686-unknown-linux-gnu/stable	2m 54s
Pass MSRV values to other jobs	3s
clippy/stable	18s
blas-msrv	1m 4s
tests/stable	2m 52s
tests/nightly	3m 8s
tests/1.64.0	12m 19s
tests/beta	2m 32s
conclusion	3s
	46m 45s

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