Use the diagnostic namespace #3931

Job	Run time
cargo-hack	5m 8s
cargo-public-api-crates (axum)	50s
cargo-public-api-crates (axum-core)	31s
check	1m 46s
check-docs	25s
dependencies-are-sorted	25s
cargo-public-api-crates (axum-extra)	1m 0s
cargo-public-api-crates (axum-macros)	29s
cargo-deny check (advisories)	34s
Spell Check with Typos	7s
cargo-deny check (bans licenses sources)	29s
test-versions (stable)	3m 9s
test-versions (beta)	2m 50s
armv5te-unknown-linux-musleabi	52s
test-docs	3m 1s
test-msrv	2m 22s
test-nightly	3m 8s
wasm32-unknown-unknown	32s
	27m 38s

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