ecdsa

dsa: make `secret_number_rfc6979` infallible; cleanups (#1405) #2775

Job	Run time
no_std (wasm32-unknown-unknown, stable)	1m 3s
test (1.85.0)	29s
no_std (thumbv7em-none-eabi, 1.85.0)	1m 5s
no_std (wasm32-unknown-unknown, 1.85.0)	1m 2s
test (stable)	36s
no_std (thumbv7em-none-eabi, stable)	1m 4s
	5m 19s

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