Let `dead_code` lint work on `#[instrument]`ed functions #5364

Job	Run time
cargo check	53s
cargo check (+MSRV -Zminimal-versions)	0s
warnings	0s
cargo check (feature combinations)	0s
build tests (wasm)	0s
cargo fmt	0s
cargo test (${{ matrix.rust }} on ${{ matrix.os }})	0s
cargo test (feature-specific)	0s
cargo test (wasm)	0s
all systems go!	0s
	53s

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