Merge fallbacks with the rest of the router #5250

Job	Run time
check	39s
cargo-hack	2m 43s
check-docs	12s
cargo-public-api-crates (axum)	38s
cargo-deny check (advisories)	23s
dependencies-are-sorted	14s
cargo-public-api-crates (axum-core)	15s
cargo-deny check (bans licenses sources)	23s
cargo-public-api-crates (axum-extra)	27s
Spell Check with Typos	6s
cargo-public-api-crates (axum-macros)	15s
test-docs	1m 32s
armv5te-unknown-linux-musleabi	21s
test-msrv	2m 8s
test-nightly	1m 14s
test-versions (stable)	1m 8s
wasm32-unknown-unknown	9s
test-versions (beta)	1m 14s
	14m 1s

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