Update spin requirement from 0.10.0 to 0.12.0 #3417

Job	Run time
cargo build --target thumbv6m-none-eabi	28s
cargo minimal-versions build	27s
cargo bench	43s
cargo +1.36 build (futures-{core, io, sink})	48s
cargo +beta build	38s
cargo +nightly build	39s
cargo build --target thumbv7m-none-eabi	27s
cargo clippy	24s
cargo doc	22s
cargo test (macos-latest)	5m 44s
cargo test -Z sanitizer=address	1m 6s
cargo test -Z sanitizer=thread	1m 8s
cargo miri test	10m 3s
cargo test -Z sanitizer=memory	1m 3s
cargo +stable build	32s
cargo test (ubuntu-24.04-arm)	2m 50s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 4s
cargo test (ubuntu-latest)	2m 44s
cargo +1.71 build	40s
cargo test (windows-latest)	5m 34s
cargo test (ubuntu-24.04-arm, armv7-unknown-linux-gnueabihf)	3m 1s
cargo hack check --feature-powerset	2m 32s
tidy	17s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 41s
cargo test (ubuntu-latest, s390x-unknown-linux-gnu)	4m 42s
	56m 37s

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