🐛 Fix user_id to become null on pin update (rare bug)

app/routes/pins.py

@@ -74,6 +74,9 @@ async def update_pin(id: str, pin: PinDTO, current_user: User = Depends(get_curr
             if not permission:
                 raise HTTPException(status_code=403, detail="You don't have permission to edit this pin")
         
+        # Ajouter l'ID de l'utilisateur au PinDTO
+        pin.user_id = current_user.uid
+        
         # Mettre à jour le pin
         pins_collection.update_one({"_id": ObjectId(id)}, {"$set": pin.model_dump()})