Adds participant base data (#2922)

Author: kevgliss

src/dispatch/participant/models.py

@@ -90,7 +90,7 @@ class ParticipantRead(ParticipantBase):
     individual: Optional[IndividualContactRead]
 
 
-class ParticipantReadMinimal(DispatchBase):
+class ParticipantReadMinimal(ParticipantBase):
     id: PrimaryKey
     participant_roles: Optional[List[ParticipantRoleReadMinimal]] = []
     individual: Optional[IndividualContactReadMinimal]