⬆ Upgrade code to support pydantic V2 (#615)

src/backend/app/schemas/item.py

@@ -1,4 +1,4 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 
 
 # Shared properties
@@ -22,9 +22,7 @@ class ItemInDBBase(ItemBase):
     id: int
     title: str
     owner_id: int
-
-    class Config:
-        orm_mode = True
+    model_config = ConfigDict(from_attributes=True)
 
 
 # Properties to return to client