slh-dsa,xmss: replace sha3 with shake #167

Job	Run time
test (1.85.0)	18s
test (stable)	18s
build (thumbv7em-none-eabi, 1.85.0)	15s
build (wasm32-unknown-unknown, 1.85.0)	17s
build (wasm32-unknown-unknown, stable)	19s
build (thumbv7em-none-eabi, stable)	18s
	1m 45s

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