Expand Zip to up to 9 producers (#1559) #609

Job	Run time
clippy/stable	19s
Pass MSRV values to other jobs	4s
cross_test/s390x-unknown-linux-gnu/stable	8m 9s
miri	10m 45s
cross_test/i686-unknown-linux-gnu/stable	1m 59s
nostd/thumbv6m-none-eabi/stable	17s
cargo-careful	2m 16s
format/nightly	15s
docs/nightly	24s
tests/stable	2m 29s
blas-msrv	45s
tests/1.64.0	3m 22s
tests/nightly	3m 11s
tests/beta	2m 39s
conclusion	4s
	36m 58s

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