Bump `password-hash` dependency to v0.6.0-rc.0 #922

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	15s
build (1.72.0, wasm32-unknown-unknown)	16s
build (stable, thumbv7em-none-eabi)	29s
build (stable, wasm32-unknown-unknown)	19s
test (1.72.0)	42s
test (stable)	44s
minimal-versions / minimal-versions	1m 38s
	4m 23s

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