Relax implicit Send / Sync bounds (#3555) #5860

Job	Run time
check	45s
cargo-hack	2m 35s
cargo-public-api-crates (axum-core)	40s
check-docs	31s
cargo-public-api-crates (axum-macros)	42s
cargo-public-api-crates (axum)	57s
cargo-public-api-crates (axum-extra)	51s
Spell Check with Typos	7s
dependencies-are-sorted	4s
cargo-deny check (bans licenses sources)	24s
cargo-deny check (advisories)	27s
test-nightly	1m 7s
test-versions (stable)	1m 12s
test-versions (beta)	1m 16s
armv5te-unknown-linux-musleabi	33s
test-msrv	2m 50s
test-docs	1m 2s
wasm32-unknown-unknown	25s
	16m 28s

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