spki

x509-cert: use `SubjectPublicKeyInfoOwned::from_key` #2644

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	4m 7s
build (1.65.0, wasm32-unknown-unknown)	4m 8s
build (stable, thumbv7em-none-eabi)	27s
build (stable, wasm32-unknown-unknown)	26s
test (1.65.0)	5m 0s
test (stable)	1m 18s
minimal-versions / minimal-versions	1m 6s
	16m 32s

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