Remove useless #[allow(warnings)] #3760

Job	Run time
check-docs	30s
cargo-hack	4m 54s
cargo-public-api-crates (axum)	45s
cargo-public-api-crates (axum-core)	18s
cargo-public-api-crates (axum-extra)	42s
cargo-public-api-crates (axum-macros)	21s
dependencies-are-sorted	23s
check	1m 12s
cargo-deny check (advisories)	1m 21s
cargo-deny check (bans licenses sources)	1m 24s
test-nightly	2m 54s
test-msrv	2m 42s
test-docs	3m 11s
armv5te-unknown-linux-musleabi	44s
test-versions (stable)	3m 0s
test-versions (beta)	2m 37s
wasm32-unknown-unknown	33s
	27m 31s

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