keccak: test `asm` feature in CI #257

Job	Run time
miri (x86_64-unknown-linux-gnu)	47s
test-simd	15s
minimal-versions / minimal-versions	32s
set-msrv / set-msrv	5s
miri (s390x-unknown-linux-gnu)	1m 6s
aarch64-sha3 (stable)	44s
build (1.85.0, wasm32-unknown-unknown)	16s
test (aarch64-apple-darwin, macos-latest, 1.85.0)	18s
aarch64-sha3 (1.85.0)	36s
build (1.85.0, thumbv7em-none-eabi)	17s
test (aarch64-apple-darwin, macos-latest, stable)	24s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	18s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	18s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	20s
	6m 34s

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