chore: remove unused `nodelay` field in `Serve` #5108

Job	Run time
cargo-hack	3m 43s
check	55s
cargo-public-api-crates (axum)	30s
check-docs	25s
cargo-public-api-crates (axum-core)	19s
cargo-deny check (advisories)	27s
dependencies-are-sorted	14s
cargo-public-api-crates (axum-extra)	29s
Spell Check with Typos	6s
cargo-deny check (bans licenses sources)	26s
cargo-public-api-crates (axum-macros)	17s
armv5te-unknown-linux-musleabi	30s
test-nightly	1m 25s
test-docs	1m 25s
test-msrv	2m 24s
test-versions (stable)	2m 33s
wasm32-unknown-unknown	17s
test-versions (beta)	2m 29s
	18m 54s

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