Add space between SSE field and value for compatibility #3816

Job	Run time
check	1m 4s
cargo-public-api-crates (axum)	44s
cargo-public-api-crates (axum-core)	31s
cargo-public-api-crates (axum-extra)	43s
cargo-public-api-crates (axum-macros)	21s
dependencies-are-sorted	23s
cargo-hack	5m 42s
check-docs	33s
cargo-deny check (advisories)	35s
cargo-deny check (bans licenses sources)	37s
test-docs	3m 9s
test-versions (stable)	3m 5s
test-versions (beta)	2m 11s
test-nightly	3m 56s
armv5te-unknown-linux-musleabi	45s
wasm32-unknown-unknown	36s
test-msrv	2m 0s
	26m 55s

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