Used db_update in patch to bypass validate and on_update method

erpnext/patches/v8_0/manufacturer_childtable_migrate.py

@@ -20,6 +20,5 @@ def execute():
 				"manufacturer": item.manufacturer,
 				"manufacturer_part_no": item.manufacturer_part_no
 			})
-            item_doc.flags.ignore_validate = True
-            item_doc.flags.ignore_mandatory = True
-            item_doc.save()
+			
+			item_doc.get("manufacturers")[0].db_update()