Complain about a missing digest when doing deterministic ECDSA

We need a digest for the none when doing deterministic ECDSA. Give a
better error message if one hasn't been supplied.

See openssl/openssl#25012

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25057)