Release axum 0.8.4 and related crates #5775

Job	Run time
Spell Check with Typos	7s
check	2m 17s
check-docs	49s
cargo-hack	3m 18s
cargo-public-api-crates (axum)	41s
cargo-public-api-crates (axum-extra)	30s
cargo-public-api-crates (axum-core)	23s
cargo-public-api-crates (axum-macros)	23s
dependencies-are-sorted	35s
cargo-deny check (bans licenses sources)	35s
cargo-deny check (advisories)	36s
test-nightly	30s
test-versions (beta)	3m 19s
test-versions (stable)	3m 10s
test-msrv	2m 15s
test-docs	1m 33s
wasm32-unknown-unknown	26s
armv5te-unknown-linux-musleabi	1m 3s
	22m 30s

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