Avoid clone in fallback #4901

Job	Run time
check-docs	23s
cargo-hack	5m 11s
check	1m 32s
cargo-public-api-crates (axum)	30s
cargo-deny check (advisories)	25s
cargo-public-api-crates (axum-core)	21s
dependencies-are-sorted	14s
cargo-public-api-crates (axum-extra)	37s
cargo-deny check (bans licenses sources)	25s
Spell Check with Typos	4s
cargo-public-api-crates (axum-macros)	25s
test-nightly	1m 35s
test-msrv	1m 50s
test-docs	1m 35s
armv5te-unknown-linux-musleabi	52s
test-versions (stable)	2m 48s
test-versions (beta)	2m 39s
wasm32-unknown-unknown	13s
	21m 39s

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