ecdsa

ecdsa: der: use impl `EncodeValue`/`DecodeValue` on `SignatureRef` #2026

Job	Run time
test (1.85.0)	18s
test (stable)	24s
no_std (thumbv7em-none-eabi, 1.85.0)	52s
no_std (wasm32-unknown-unknown, 1.85.0)	41s
no_std (wasm32-unknown-unknown, stable)	44s
no_std (thumbv7em-none-eabi, stable)	52s
	3m 51s

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