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signature: async `rand_core` v0.9 updates (#1749) #2612

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	20s
build (1.81.0, wasm32-unknown-unknown)	21s
build (stable, thumbv7em-none-eabi)	15s
test (1.81.0)	17s
build (stable, wasm32-unknown-unknown)	25s
test (stable)	13s
	1m 51s

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