cms: remove unused transitive `pem` feature activation (#1565) #1527

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	28s
build (1.81.0, wasm32-unknown-unknown)	25s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	20s
minimal-versions	0s
test (1.81.0)	1m 57s
test (stable)	1m 53s
	5m 22s

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