chore: update msrv to 1.87 #650

Job	Run time
Pass MSRV values to other jobs	2s
cross_test/s390x-unknown-linux-gnu/stable	10m 10s
nostd/thumbv6m-none-eabi/stable	21s
format/nightly	14s
miri	10m 13s
cross_test/i686-unknown-linux-gnu/stable	2m 52s
clippy/stable	25s
docs/nightly	21s
cargo-careful	2m 12s
blas-msrv	1m 7s
tests/stable	2m 51s
tests/beta	2m 56s
tests/nightly	2m 35s
tests/1.87.0	2m 44s
conclusion	0s
	39m 3s

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