der

der: fix CI config for path to `der_derive` #2951

Job	Run time
build (1.71.0, thumbv7em-none-eabi)	1m 35s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.71.0, sudo apt update && sudo apt install gcc-mult...	11m 13s
build (1.71.0, wasm32-unknown-unknown)	1m 32s
minimal-versions	0s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	10m 22s
build (stable, thumbv7em-none-eabi)	1m 32s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.71.0)	11m 17s
build (stable, wasm32-unknown-unknown)	1m 26s
derive (1.71.0)	33s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	9m 50s
derive (stable)	24s
	49m 44s

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