fix: import for type checking

keep/api/models/alert.py

@@ -4,7 +4,7 @@
 import logging
 import uuid
 from enum import Enum
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional, TYPE_CHECKING
 from uuid import UUID
 
 import pytz
@@ -19,6 +19,9 @@
 from sqlalchemy import desc
 from sqlmodel import col
 
+if TYPE_CHECKING:
+    from keep.api.models.db.alert import Incident
+
 logger = logging.getLogger(__name__)