Bump `signature` dependency to v3 (#2326) #2502

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	18s
build (1.85.0, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	17s
build (stable, thumbv7em-none-eabi)	16s
test (1.85.0)	28s
test (stable)	27s
minimal-versions / minimal-versions	32s
	2m 36s

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