v0.6.x chore(sse): add space between field and value for compatibility #3818

Job	Run time
cargo-hack	4m 31s
check	1m 2s
check-docs	31s
cargo-public-api-crates (axum)	52s
cargo-public-api-crates (axum-core)	24s
cargo-public-api-crates (axum-extra)	48s
cargo-public-api-crates (axum-macros)	24s
cargo-deny check (advisories)	29s
cargo-deny check (bans licenses sources)	32s
dependencies-are-sorted	20s
test-msrv	2m 17s
test-versions (stable)	2m 26s
test-versions (beta)	1m 52s
test-docs	3m 14s
armv5te-unknown-linux-musleabi	45s
test-nightly	3m 56s
wasm32-unknown-unknown	31s
	24m 54s

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