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

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

Tests/test_file_png.py

@@ -4,7 +4,7 @@
 import sys
 import warnings
 import zlib
-from io import BytesIO, TextIOWrapper
+from io import BytesIO
 from pathlib import Path
 from types import ModuleType
 from typing import Any, cast