Expand Zip to up to 9 producers #608

Job	Run time
clippy/stable	15s
miri	10m 2s
format/nightly	14s
cross_test/i686-unknown-linux-gnu/stable	2m 13s
cross_test/s390x-unknown-linux-gnu/stable	7m 29s
nostd/thumbv6m-none-eabi/stable	10s
cargo-careful	1m 46s
Pass MSRV values to other jobs	2s
docs/nightly	21s
blas-msrv	48s
tests/beta	2m 26s
tests/stable	2m 27s
tests/1.64.0	3m 23s
tests/nightly	2m 41s
conclusion	4s
	34m 21s

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