Release axum v0.8.0 #5219

Job	Run time
cargo-hack	5m 29s
check	1m 59s
cargo-public-api-crates (axum)	55s
check-docs	26s
cargo-public-api-crates (axum-core)	39s
cargo-deny check (advisories)	25s
dependencies-are-sorted	15s
cargo-public-api-crates (axum-extra)	50s
cargo-deny check (bans licenses sources)	24s
Spell Check with Typos	6s
cargo-public-api-crates (axum-macros)	38s
armv5te-unknown-linux-musleabi	46s
test-docs	1m 45s
test-msrv	2m 37s
test-nightly	1m 29s
test-versions (stable)	2m 48s
wasm32-unknown-unknown	16s
test-versions (beta)	3m 9s
	24m 56s

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