ed448

ed25519: bump `rand_core` to `0.9.0` #330

Job	Run time
test (1.81.0)	24s
test (stable)	17s
build (thumbv7em-none-eabi, 1.81.0)	18s
build (thumbv7em-none-eabi, stable)	15s
build (wasm32-unknown-unknown, 1.81.0)	18s
build (wasm32-unknown-unknown, stable)	17s
	1m 49s

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