Fix items-after-test-module clippy warning on 1.75.0-beta.1 (#2318) #4001

Job	Run time
check-docs	40s
cargo-public-api-crates (axum)	1m 3s
cargo-public-api-crates (axum-core)	46s
check	2m 8s
cargo-hack	6m 33s
cargo-public-api-crates (axum-extra)	57s
cargo-deny check (advisories)	23s
cargo-public-api-crates (axum-macros)	48s
dependencies-are-sorted	48s
Spell Check with Typos	4s
cargo-deny check (bans licenses sources)	25s
test-versions (stable)	4m 48s
test-msrv	7m 10s
test-versions (beta)	4m 26s
armv5te-unknown-linux-musleabi	1m 13s
test-docs	2m 25s
test-nightly	2m 36s
wasm32-unknown-unknown	36s
	37m 49s

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