refactor: add ConfigDict to project_schemas

src/backend/app/projects/project_schemas.py

@@ -20,7 +20,7 @@
 from typing import List, Optional
 
 from geojson_pydantic import Feature as GeojsonFeature
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 
 from app.db import db_models
 from app.models.enums import ProjectPriority, ProjectStatus, TaskSplitType