Fix items-after-test-module clippy warning on 1.75.0-beta.1 #3998

Job	Run time
check-docs	54s
check	2m 11s
cargo-hack	6m 30s
cargo-public-api-crates (axum)	59s
cargo-public-api-crates (axum-core)	46s
cargo-deny check (advisories)	23s
cargo-public-api-crates (axum-extra)	1m 2s
dependencies-are-sorted	47s
Spell Check with Typos	5s
cargo-deny check (bans licenses sources)	26s
cargo-public-api-crates (axum-macros)	48s
test-docs	2m 24s
test-msrv	7m 5s
armv5te-unknown-linux-musleabi	1m 9s
test-nightly	2m 15s
wasm32-unknown-unknown	31s
test-versions (stable)	4m 28s
test-versions (beta)	4m 36s
	37m 19s

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