Remove unused dependency heck from axum-macros #4607

Job	Run time
check-docs	56s
cargo-public-api-crates (axum)	42s
check	1m 51s
cargo-public-api-crates (axum-core)	29s
cargo-hack	5m 55s
cargo-public-api-crates (axum-extra)	33s
cargo-deny check (advisories)	23s
cargo-public-api-crates (axum-macros)	25s
cargo-deny check (bans licenses sources)	23s
dependencies-are-sorted	22s
Spell Check with Typos	5s
test-msrv	4m 57s
test-versions (stable)	2m 55s
test-versions (beta)	3m 4s
test-docs	2m 16s
armv5te-unknown-linux-musleabi	59s
test-nightly	2m 8s
wasm32-unknown-unknown	32s
	28m 55s

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