perf: eliminate string allocations in WebSocket protocol matching #5814

Job	Run time
check-docs	43s
cargo-public-api-crates (axum-core)	36s
dependencies-are-sorted	4s
cargo-deny check (advisories)	25s
check	38s
cargo-public-api-crates (axum-macros)	39s
cargo-public-api-crates (axum)	55s
Spell Check with Typos	6s
cargo-hack	2m 46s
cargo-public-api-crates (axum-extra)	47s
cargo-deny check (bans licenses sources)	24s
test-nightly	1m 8s
test-msrv	2m 38s
test-docs	53s
armv5te-unknown-linux-musleabi	38s
test-versions (beta)	1m 7s
wasm32-unknown-unknown	20s
test-versions (stable)	1m 24s
	16m 11s

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