pkcs1

der: fix CI config for path to `der_derive` (#1460) #3098

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	30s
minimal-versions	0s
build (1.72.0, wasm32-unknown-unknown)	30s
test (1.72.0)	44s
build (stable, thumbv7em-none-eabi)	26s
test (stable)	38s
build (stable, wasm32-unknown-unknown)	27s
	3m 15s

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