use afit and remove async-trait #3991

Job	Run time
check-docs	23s
cargo-hack	17s
check	1m 48s
cargo-public-api-crates (axum)	1m 23s
cargo-deny check (advisories)	36s
dependencies-are-sorted	21s
cargo-public-api-crates (axum-core)	1m 11s
cargo-deny check (bans licenses sources)	32s
Spell Check with Typos	6s
cargo-public-api-crates (axum-extra)	57s
cargo-public-api-crates (axum-macros)	50s
test-docs	0s
test-nightly	0s
test-versions	0s
armv5te-unknown-linux-musleabi	0s
test-msrv	0s
wasm32-unknown-unknown	0s
	8m 24s

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