Various fixes too make the CI green #2808

Job	Run time
cargo +1.36 build (futures-{core, io, sink})	53s
cargo bench	45s
cargo +stable build	33s
cargo minimal-versions build	27s
cargo hack check --feature-powerset	54s
cargo +beta build	38s
cargo build --target thumbv7m-none-eabi	28s
cargo +nightly build	37s
cargo build --target thumbv6m-none-eabi	23s
cargo test (ubuntu-latest)	53s
cargo +1.56 build	53s
cargo test (macos-latest)	54s
cargo test (windows-latest)	42s
cargo clippy	23s
cargo doc	18s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	53s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	52s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	54s
cargo fmt	4s
cargo miri test	53s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	52s
cargo test -Z sanitizer=address	51s
cargo test -Z sanitizer=memory	52s
cargo test -Z sanitizer=thread	51s
	16m 43s

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