Sync with 0.3.31 #2859

Job	Run time
cargo +1.36 build (futures-{core, io, sink})	33s
cargo bench	54s
cargo clippy	25s
cargo +stable build	41s
cargo +beta build	38s
cargo hack check --feature-powerset	2m 19s
cargo minimal-versions build	24s
cargo +nightly build	35s
cargo miri test	12m 10s
cargo build --target thumbv7m-none-eabi	27s
cargo test -Z sanitizer=address	3m 21s
cargo +1.56 build	1m 10s
cargo build --target thumbv6m-none-eabi	26s
cargo test -Z sanitizer=memory	4m 55s
cargo test (ubuntu-latest)	2m 42s
cargo test -Z sanitizer=thread	2m 26s
cargo doc	17s
cargo fmt	7s
cargo test (macos-latest)	6m 2s
cargo test (windows-latest)	4m 48s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 34s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 24s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 43s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 28s
	1h 5m 29s

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