Release axum 0.7 (#2354) #4079

Job	Run time
check	45s
check-docs	22s
cargo-public-api-crates (axum)	57s
cargo-hack	3m 5s
cargo-public-api-crates (axum-core)	51s
dependencies-are-sorted	14s
cargo-deny check (advisories)	27s
cargo-public-api-crates (axum-extra)	58s
Spell Check with Typos	4s
cargo-deny check (bans licenses sources)	23s
cargo-public-api-crates (axum-macros)	1m 12s
test-docs	1m 44s
armv5te-unknown-linux-musleabi	35s
test-nightly	1m 45s
test-msrv	7m 40s
test-versions (stable)	2m 9s
wasm32-unknown-unknown	26s
test-versions (beta)	2m 6s
	25m 43s

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