Fix `clippy::needless_lifetimes` and `clippy::type_complexity` #12

Job	Run time
tests (1.68.0)	48s
miri	4m 25s
tests (stable, arbitrary)	36s
Check MSRV and minimal-versions	33s
tests (stable, quickcheck)	38s
clippy	16s
nostd_build (1.68.0, thumbv6m-none-eabi)	18s
tests (stable, rayon)	50s
nostd_build (stable, thumbv6m-none-eabi)	19s
tests (stable, serde)	55s
tests (stable, borsh)	36s
tests (stable, std)	52s
tests (beta)	35s
tests (nightly, test build benchmarks)	38s
Success	1s
	12m 20s

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