Release axum 0.8.4 and related crates #5772

Job	Run time
check	2m 22s
cargo-hack	3m 30s
cargo-public-api-crates (axum-core)	37s
cargo-public-api-crates (axum)	56s
check-docs	50s
dependencies-are-sorted	35s
Spell Check with Typos	7s
cargo-deny check (advisories)	33s
cargo-public-api-crates (axum-macros)	37s
cargo-deny check (bans licenses sources)	27s
cargo-public-api-crates (axum-extra)	52s
test-versions (stable)	3m 11s
test-versions (beta)	3m 43s
test-nightly	1m 28s
wasm32-unknown-unknown	25s
armv5te-unknown-linux-musleabi	1m 0s
test-docs	1m 30s
test-msrv	2m 43s
	25m 26s

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