bump `password-hash` to `0.6.0-pre.0` (#497) #889

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	22s
build (1.72.0, wasm32-unknown-unknown)	17s
minimal-versions	0s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	17s
test (1.72.0)	31s
test (stable)	20s
	2m 6s

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