fix cargo test no default features in v0.6.x #5005

Job	Run time
check	1m 4s
check-docs	47s
cargo-hack	3m 38s
cargo-public-api-crates (axum)	54s
cargo-deny check (advisories)	15s
cargo-public-api-crates (axum-core)	42s
dependencies-are-sorted	42s
Spell Check with Typos	7s
cargo-public-api-crates (axum-extra)	46s
cargo-deny check (bans licenses sources)	15s
cargo-public-api-crates (axum-macros)	37s
test-versions	0s
test-msrv	0s
armv5te-unknown-linux-musleabi	0s
test-docs	0s
test-nightly	0s
wasm32-unknown-unknown	0s
	9m 47s

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