cms

x509-cert: use `SubjectPublicKeyInfoOwned::from_key` #826

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	4m 9s
test (1.65.0)	7m 6s
build (1.65.0, wasm32-unknown-unknown)	5m 7s
test (stable)	2m 47s
build (stable, thumbv7em-none-eabi)	32s
build (stable, wasm32-unknown-unknown)	34s
minimal-versions / minimal-versions	2m 17s
	22m 32s

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