spki

der: `PemReader` simplifications (#1476) #3114

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	25s
build (1.72.0, wasm32-unknown-unknown)	25s
build (stable, thumbv7em-none-eabi)	25s
minimal-versions	0s
build (stable, wasm32-unknown-unknown)	20s
test (1.72.0)	1m 11s
test (stable)	1m 4s
	3m 50s

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