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Avoid index clone in next #637

Job	Run time
Pass MSRV values to other jobs	4s
format/nightly	15s
clippy/stable	33s
docs/nightly	21s
miri	10m 55s
cross_test/i686-unknown-linux-gnu/stable	2m 41s
nostd/thumbv6m-none-eabi/stable	18s
cross_test/s390x-unknown-linux-gnu/stable	9m 9s
cargo-careful	2m 11s
tests/stable	2m 55s
tests/1.64.0	3m 24s
tests/nightly	3m 12s
tests/beta	2m 34s
blas-msrv	42s
conclusion	2s
	39m 16s