cmpv2

x509-cert: use `SubjectPublicKeyInfoOwned::from_key` #813

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	4m 10s
test (1.65.0)	12m 6s
build (1.65.0, wasm32-unknown-unknown)	4m 24s
build (stable, thumbv7em-none-eabi)	29s
test (stable)	6m 55s
build (stable, wasm32-unknown-unknown)	33s
minimal-versions / minimal-versions	5m 29s
	34m 6s

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