crmf

x509-cert: use `SubjectPublicKeyInfoOwned::from_key` #903

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	4m 5s
build (1.65.0, wasm32-unknown-unknown)	4m 14s
test (1.65.0)	5m 26s
build (stable, thumbv7em-none-eabi)	25s
test (stable)	1m 37s
build (stable, wasm32-unknown-unknown)	40s
minimal-versions / minimal-versions	1m 27s
	17m 54s

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