Tries to stabilize MSRV CI/CD. #392

Job	Run time
format/nightly	13s
nostd/thumbv6m-none-eabi/stable	11s
clippy/stable	10s
Pass MSRV values to other jobs	4s
cargo-careful	2m 0s
cross_test/s390x-unknown-linux-gnu/stable	7m 7s
docs/nightly	20s
cross_test/i686-unknown-linux-gnu/stable	1m 16s
miri	8m 3s
blas-msrv	19s
tests/1.64.0	4m 24s
tests/nightly	2m 51s
tests/stable	2m 23s
tests/beta	2m 27s
conclusion	3s
	31m 51s

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