Ecosystem: add spring-rs #4708

Job	Run time
check	55s
check-docs	25s
cargo-hack	3m 33s
cargo-public-api-crates (axum)	38s
cargo-public-api-crates (axum-core)	20s
cargo-deny check (advisories)	22s
dependencies-are-sorted	18s
Spell Check with Typos	4s
cargo-deny check (bans licenses sources)	24s
cargo-public-api-crates (axum-extra)	42s
cargo-public-api-crates (axum-macros)	30s
armv5te-unknown-linux-musleabi	43s
test-docs	1m 51s
test-nightly	2m 6s
test-msrv	2m 16s
test-versions (stable)	2m 35s
wasm32-unknown-unknown	25s
test-versions (beta)	1m 50s
	19m 57s

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