aucpace: fix lints #137

Job	Run time
test (stable)	28s
test (1.61)	5m 32s
build (stable, thumbv7em-none-eabi)	17s
build (1.61, thumbv7em-none-eabi)	5m 15s
build (stable, wasm32-unknown-unknown)	19s
build (1.61, wasm32-unknown-unknown)	5m 31s
	17m 22s

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