Remove unused import in trybuild test #5059

Job	Run time
check	1m 55s
cargo-public-api-crates (axum)	31s
cargo-public-api-crates (axum-core)	20s
cargo-public-api-crates (axum-extra)	27s
cargo-hack	5m 59s
cargo-public-api-crates (axum-macros)	17s
check-docs	25s
cargo-deny check (advisories)	25s
cargo-deny check (bans licenses sources)	24s
dependencies-are-sorted	16s
Spell Check with Typos	4s
test-docs	1m 40s
test-msrv	1m 47s
armv5te-unknown-linux-musleabi	1m 5s
test-nightly	1m 34s
test-versions (stable)	3m 31s
wasm32-unknown-unknown	13s
test-versions (beta)	3m 5s
	23m 58s

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