pkcs1

Bump to `signature` 3 #3798

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	43s
build (stable, thumbv7em-none-eabi)	33s
build (stable, wasm32-unknown-unknown)	32s
build (1.85.0, thumbv7em-none-eabi)	33s
test (stable)	45s
test (1.85.0)	48s
minimal-versions	0s
	3m 54s

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