(system_user)-fix change password. convert user_id UUID to str

app/system_users/services/service.py

@@ -136,7 +136,7 @@ class SystemUserService:
     async def get_user_by_id(self, user_id: UUID) -> Optional[SystemUserModel]:
         """Get user by user_id."""
         try:
-            user_doc = await self.collection.find_one({"user_id": user_id})
+            user_doc = await self.collection.find_one({"user_id": str(user_id)})
             if user_doc:
                 return SystemUserModel(**user_doc)
             return None