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chore: update msrv to 1.87 #651

Job	Run time
miri	10m 10s
nostd/thumbv6m-none-eabi/stable	19s
docs/nightly	22s
Pass MSRV values to other jobs	3s
cross_test/s390x-unknown-linux-gnu/stable	8m 3s
clippy/stable	29s
format/nightly	15s
cross_test/i686-unknown-linux-gnu/stable	2m 12s
cargo-careful	1m 37s
blas-msrv	42s
tests/stable	2m 30s
tests/1.87.0	2m 17s
tests/nightly	2m 48s
tests/beta	2m 25s
conclusion	3s
	34m 15s