Update stubgen.py

Author: BobTheBuidler

mypy/stubgen.py

@@ -1028,7 +1028,7 @@ def _get_namedtuple_fields(self, call: CallExpr) -> list[tuple[str, str]] | None
             elif isinstance(fields_arg, (ListExpr, TupleExpr)):
                 field_names = []
                 for field in fields_arg.items:
-                    folded = constant_fold_expr(fields_arg, "<unused>")
+                    folded = constant_fold_expr(field, "<unused>")
                     if not isinstance(folded, str):
                         return None
                     field_names.append(folded)