bp384

primeorder: use `PrimeField::NUM_BITS` to bound scalar size when mult… #1426

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	31s
build (1.81.0, wasm32-unknown-unknown)	31s
build (stable, thumbv7em-none-eabi)	24s
doc	43s
build (stable, wasm32-unknown-unknown)	32s
test (1.81.0)	35s
test (stable)	38s
	3m 54s

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