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refactor: use Ref (or Owned) `der` types from RustCrypto/formats #1313

Job	Run time
nightly	58s
test (1.85.0)	1m 5s
build (stable, thumbv7em-none-eabi)	18s
build (1.85.0, wasm32-unknown-unknown)	27s
test (stable)	56s
build (stable, wasm32-unknown-unknown)	23s
build (1.85.0, thumbv7em-none-eabi)	23s
minimal-versions	0s
	4m 30s