Fix new clippy lints (#3054) #5066

Job	Run time
cargo-hack	6m 51s
check-docs	45s
check	2m 43s
cargo-public-api-crates (axum)	31s
cargo-deny check (advisories)	25s
cargo-public-api-crates (axum-core)	19s
dependencies-are-sorted	45s
Spell Check with Typos	4s
cargo-public-api-crates (axum-extra)	28s
cargo-deny check (bans licenses sources)	27s
cargo-public-api-crates (axum-macros)	17s
test-docs	2m 5s
test-nightly	1m 38s
armv5te-unknown-linux-musleabi	1m 12s
test-msrv	2m 49s
test-versions (stable)	4m 20s
wasm32-unknown-unknown	31s
test-versions (beta)	4m 27s
	30m 37s

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