refactor: using optional keyword

schemas/deal.py

@@ -1,3 +1,5 @@
+from typing import Optional
+
 from schemas.base import BaseSchema, BaseResponse
 
 
@@ -15,9 +17,9 @@ class DealSchema(BaseDealSchema):
 
 
 class UpdateDealSchema(BaseSchema):
-    name: str | None = None
-    lexorank: str | None = None
-    status_id: int | None = None
+    name: Optional[str] = None
+    lexorank: Optional[str] = None
+    status_id: Optional[int] = None
 
 
 # endregion