bump `password-hash` to `0.6.0-pre.0` (#497) #892

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	28s
build (1.72.0, wasm32-unknown-unknown)	18s
test (1.72.0)	39s
build (stable, thumbv7em-none-eabi)	29s
build (stable, wasm32-unknown-unknown)	1m 7s
test (stable)	42s
minimal-versions / minimal-versions	2m 6s
	5m 49s

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