Bump `password-hash` to v0.6.0-pre #1804

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 41s
minimal-versions	21s
build (1.65.0, wasm32-unknown-unknown)	2m 4s
test (1.65.0)	1m 45s
build (stable, thumbv7em-none-eabi)	17s
test (stable)	18s
build (stable, wasm32-unknown-unknown)	18s
	6m 44s

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