slh-dsa,xmss: replace sha3 with shake #1145

Job	Run time
test (1.85.0)	2m 53s
test (stable)	2m 55s
no_std (wasm32-unknown-unknown, stable)	57s
no_std (wasm32-unknown-unknown, 1.85.0)	52s
no_std (thumbv7em-none-eabi, 1.85.0)	58s
no_std (thumbv7em-none-eabi, stable)	56s
	9m 31s

Provide feedback