password-hash: fix `needless_as_bytes` Clippy lint (#1715) #1840

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	18s
build (1.81.0, wasm32-unknown-unknown)	17s
test (1.81.0)	19s
build (stable, thumbv7em-none-eabi)	19s
test (stable)	13s
build (stable, wasm32-unknown-unknown)	28s
minimal-versions / minimal-versions	39s
	2m 33s

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