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refactor: use Ref (or Owned) `der` types from RustCrypto/formats #1315

Job	Run time
test (1.85.0)	5m 5s
build (stable, thumbv7em-none-eabi)	18s
build (1.85.0, thumbv7em-none-eabi)	22s
build (1.85.0, wasm32-unknown-unknown)	27s
nightly	1m 9s
build (stable, wasm32-unknown-unknown)	18s
test (stable)	4m 52s
minimal-versions	0s
	12m 31s