sha3: bump `keccak` dependency to v0.2.0-pre.0 #962

Job	Run time
cross (1.72.0, aarch64-unknown-linux-gnu, default)	49s
cross (1.72.0, powerpc-unknown-linux-gnu, default)	47s
cross (stable, aarch64-unknown-linux-gnu, default)	51s
cross (stable, powerpc-unknown-linux-gnu, default)	31s
minimal-versions / minimal-versions	40s
set-msrv / set-msrv	2s
linux (x86_64-unknown-linux-gnu, 1.72.0)	37s
windows (x86_64-pc-windows-gnu, 1.72.0)	59s
linux (x86_64-unknown-linux-gnu, stable)	35s
build (1.72.0, thumbv7em-none-eabi)	20s
windows (x86_64-pc-windows-gnu, stable)	2m 1s
macos (1.72.0)	43s
build (1.72.0, wasm32-unknown-unknown)	22s
macos (stable)	38s
build (1.72.0, loongarch64-unknown-linux-gnu)	27s
build (stable, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	14s
build (stable, loongarch64-unknown-linux-gnu)	14s
	11m 10s

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