Features: 1) Added get_vendor_instance usage to replace direct vendor class handling.

Fixes: (None).

Extra: 1) Minor refactor to enhance vendor instance management logic.

core/tasks.py

@@ -43,7 +43,8 @@ def update_products_task():
         for vendor_class in vendors_classes:
             vendor = vendor_class()
             try:
-                if vendor.is_active:
+                vendor_instance = vendor.get_vendor_instance()
+                if vendor_instance.is_active:
                     vendor.update_stock()
                 else:
                     continue