Tries to stabilize MSRV CI/CD. #391

Job	Run time
pass-msrv	3s
cross_test/i686-unknown-linux-gnu/stable	2m 7s
cross_test/s390x-unknown-linux-gnu/stable	7m 45s
format/nightly	12s
cargo-careful	2m 12s
nostd/thumbv6m-none-eabi/stable	21s
docs/nightly	22s
miri	8m 14s
clippy/stable	17s
tests/nightly	3m 33s
tests/stable	3m 8s
tests/beta	3m 18s
tests/1.64.0	4m 18s
conclusion	3s
	35m 53s

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