spki

Bump `signature` dependency to v3 (#2326) #4766

Job	Run time
build (stable, wasm32-unknown-unknown)	27s
test (1.85.0)	1m 4s
build (stable, thumbv7em-none-eabi)	26s
build (1.85.0, wasm32-unknown-unknown)	24s
test (stable)	1m 2s
build (1.85.0, thumbv7em-none-eabi)	27s
minimal-versions / minimal-versions	41s
	4m 31s

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