password-hash: fix `needless_as_bytes` Clippy lint (#1715) #2652

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	14s
test (1.81.0)	23s
build (1.81.0, wasm32-unknown-unknown)	15s
test (stable)	21s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	20s
	1m 41s

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