sha3: bump `keccak` dependency to v0.2.0-pre.0 #828

Job	Run time
minimal-versions / minimal-versions	34s
set-msrv / set-msrv	3s
build (1.72.0, thumbv7em-none-eabi)	21s
build (1.72.0, wasm32-unknown-unknown)	19s
build (1.72.0, loongarch64-unknown-linux-gnu)	23s
test (1.72.0)	39s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	13s
test (stable)	37s
build (stable, loongarch64-unknown-linux-gnu)	21s
	3m 43s

Provide feedback