Fix `cargo hack` warnings (#3114) #5184

Job	Run time
cargo-hack	6m 21s
check	38s
check-docs	19s
cargo-public-api-crates (axum)	28s
cargo-public-api-crates (axum-core)	18s
cargo-deny check (advisories)	22s
cargo-public-api-crates (axum-extra)	26s
Spell Check with Typos	3s
dependencies-are-sorted	13s
cargo-deny check (bans licenses sources)	25s
cargo-public-api-crates (axum-macros)	17s
test-docs	1m 25s
test-versions (stable)	1m 33s
test-versions (beta)	1m 40s
test-msrv	1m 55s
test-nightly	1m 17s
wasm32-unknown-unknown	15s
armv5te-unknown-linux-musleabi	20s
	18m 15s

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