chore: no need to convert to bytes firstly for protobuf #5320

Job	Run time
cargo-hack	2m 48s
check-docs	15s
check	43s
cargo-public-api-crates (axum)	33s
cargo-public-api-crates (axum-core)	18s
dependencies-are-sorted	16s
cargo-deny check (advisories)	23s
Spell Check with Typos	5s
cargo-public-api-crates (axum-extra)	29s
cargo-deny check (bans licenses sources)	25s
cargo-public-api-crates (axum-macros)	18s
test-docs	1m 28s
test-versions (stable)	1m 16s
test-versions (beta)	1m 14s
test-nightly	1m 7s
armv5te-unknown-linux-musleabi	23s
test-msrv	2m 9s
wasm32-unknown-unknown	10s
	14m 20s

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