ghash

bump `universal-hash` to `0.6.0-pre` #308

Job	Run time
benches	14s
build (1.56.1, thumbv7em-none-eabi)	3m 16s
test (1.56.1)	3m 13s
build (1.56.1, wasm32-unknown-unknown)	3m 25s
test (stable)	11s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	10s
	10m 40s

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