Add space between SSE field and value for compatibility #3819

Job	Run time
cargo-public-api-crates (axum)	1m 3s
cargo-public-api-crates (axum-core)	25s
cargo-public-api-crates (axum-extra)	41s
cargo-public-api-crates (axum-macros)	27s
check-docs	26s
check	1m 19s
cargo-hack	5m 47s
cargo-deny check (advisories)	37s
cargo-deny check (bans licenses sources)	31s
dependencies-are-sorted	17s
test-docs	3m 51s
test-nightly	2m 45s
armv5te-unknown-linux-musleabi	50s
test-versions (stable)	3m 12s
test-versions (beta)	2m 6s
test-msrv	1m 57s
wasm32-unknown-unknown	35s
	26m 49s

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