Change CI to handle openblas MSRV compatibility #344

Job	Run time
format/nightly	13s
clippy/stable	23s
nostd/thumbv6m-none-eabi/stable	18s
tests/stable	2m 34s
tests/beta	2m 31s
blas-msrv	3m 15s
cargo-careful	1m 57s
tests/nightly	2m 25s
tests/1.64.0	2m 39s
cross_test/s390x-unknown-linux-gnu/stable	7m 45s
miri	7m 38s
docs/stable	20s
cross_test/i686-unknown-linux-gnu/stable	1m 28s
conclusion	1s
	33m 27s

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