cmac

Fix `clippy::needless_lifetimes` lints #312

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	16s
minimal-versions	0s
build (1.81.0, wasm32-unknown-unknown)	18s
test (1.81.0)	18s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	8s
test (stable)	10s
	1m 18s

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