password-hash: fix `needless_as_bytes` Clippy lint (#1715) #2952

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	39s
minimal-versions	0s
build (1.81.0, wasm32-unknown-unknown)	40s
test (1.81.0)	33s
build (stable, thumbv7em-none-eabi)	34s
test (stable)	25s
build (stable, wasm32-unknown-unknown)	34s
test (nightly)	27s
	3m 52s

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