Add space between SSE field and value for compatibility #3815

Job	Run time
check-docs	31s
check	3m 54s
cargo-hack	4m 41s
cargo-public-api-crates (axum)	1m 28s
cargo-public-api-crates (axum-core)	1m 38s
cargo-public-api-crates (axum-extra)	1m 52s
cargo-public-api-crates (axum-macros)	1m 8s
cargo-deny check (advisories)	30s
cargo-deny check (bans licenses sources)	27s
dependencies-are-sorted	1m 9s
test-nightly	3m 56s
armv5te-unknown-linux-musleabi	47s
test-docs	4m 55s
test-msrv	8m 30s
test-versions (stable)	3m 42s
test-versions (beta)	7m 39s
wasm32-unknown-unknown	39s
	47m 26s

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