message: Fix a bug in SecretProof serialization
  The commitments apparently have to be an indefinite-length array.
diff: @@ -308,7 +308,7 @@ impl cbor_event::se::Serialize for SecretProof {
  .serialize(&self.extra_gen)?
  .serialize(&self.proof)?
  .serialize(&self.parallel_proofs)?;
  - cbor_event::se::serialize_fixed_array(self.commitments.iter(), serializer)
  + cbor_event::se::serialize_indefinite_array(self.commitments.iter(), serializer)
  }
  }
  impl cbor_event::de::Deserialize for SecretProof {
  