Fix link of axum-sessions in ECOSYSTEM.md #4684

Job	Run time
cargo-hack	6m 32s
check-docs	19s
cargo-public-api-crates (axum)	41s
check	2m 10s
cargo-public-api-crates (axum-core)	25s
cargo-deny check (advisories)	23s
cargo-public-api-crates (axum-extra)	34s
dependencies-are-sorted	45s
cargo-deny check (bans licenses sources)	22s
cargo-public-api-crates (axum-macros)	23s
Spell Check with Typos	5s
test-nightly	1m 53s
test-docs	2m 0s
armv5te-unknown-linux-musleabi	35s
test-msrv	5m 35s
test-versions (stable)	2m 5s
test-versions (beta)	3m 58s
wasm32-unknown-unknown	18s
	29m 3s

Provide feedback