Fix warnings and errors from beta Rust (#2904) #4735

Job	Run time
cargo-hack	6m 9s
cargo-public-api-crates (axum)	35s
cargo-public-api-crates (axum-core)	18s
check-docs	50s
check	2m 12s
cargo-public-api-crates (axum-extra)	28s
cargo-public-api-crates (axum-macros)	21s
cargo-deny check (advisories)	26s
dependencies-are-sorted	44s
Spell Check with Typos	7s
cargo-deny check (bans licenses sources)	25s
test-msrv	5m 13s
test-nightly	2m 19s
armv5te-unknown-linux-musleabi	1m 10s
test-docs	2m 17s
test-versions (stable)	4m 10s
test-versions (beta)	3m 53s
wasm32-unknown-unknown	36s
	32m 13s

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