[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

mypyc/irbuild/expression.py

@@ -9,7 +9,7 @@
 import math
 from collections.abc import Sequence
 from functools import partial
-from typing import Callable, Union, cast
+from typing import Callable, Union
 
 from mypy.nodes import (
     ARG_NAMED,