A few clippy inspired changes (#2233) #3933

Job	Run time
check	1m 22s
check-docs	36s
cargo-hack	5m 2s
cargo-public-api-crates (axum)	48s
cargo-deny check (advisories)	29s
dependencies-are-sorted	28s
cargo-public-api-crates (axum-core)	28s
cargo-deny check (bans licenses sources)	27s
cargo-public-api-crates (axum-extra)	1m 1s
Spell Check with Typos	3s
cargo-public-api-crates (axum-macros)	18s
test-msrv	2m 27s
test-docs	2m 39s
armv5te-unknown-linux-musleabi	40s
test-nightly	2m 16s
test-versions (stable)	2m 41s
test-versions (beta)	2m 21s
wasm32-unknown-unknown	33s
	24m 39s

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