message: Update bson serialization for uuid
diff: @@ -501,7 +501,9 @@ std::ostream& operator<<(std::ostream& out, const Bson& b)
  }
  case Bson::Type::Uuid: {
  const UUID& u = static_cast<UUID>(b);
  - out << "{\"$uuid\":\"" << u.to_string() << "\"}";
  + out << "{\"$binary\": {\"base64\": \"";
  + out << u.to_base64();
  + out << "\", \"subType\": \"04\"}}";
  break;
  }
  }
  