add axum-valid to ECOSYSTEM.md (#2299) #3964

Job	Run time
cargo-hack	9m 16s
check	2m 33s
check-docs	35s
cargo-public-api-crates (axum)	1m 7s
cargo-public-api-crates (axum-core)	1m 19s
cargo-deny check (advisories)	29s
dependencies-are-sorted	20s
Spell Check with Typos	6s
cargo-deny check (bans licenses sources)	31s
cargo-public-api-crates (axum-extra)	1m 23s
cargo-public-api-crates (axum-macros)	1m 18s
test-docs	3m 33s
test-nightly	3m 9s
armv5te-unknown-linux-musleabi	1m 6s
test-msrv	9m 56s
test-versions (stable)	3m 49s
test-versions (beta)	4m 23s
wasm32-unknown-unknown	26s
	45m 19s

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