Fix types

Author: jonashaag

pandas/io/common.py

@@ -1050,7 +1050,7 @@ def _is_binary_mode(handle: FilePathOrBuffer, mode: str) -> bool:
         return False
 
     # classes that expect bytes
-    binary_classes = [BufferedIOBase, RawIOBase]
+    binary_classes: list[type] = [BufferedIOBase, RawIOBase]
     # Zstandard doesn't use any of the builtin base classes
     if _ZstdDecompressorReader is not None:
         binary_classes.append(_ZstdDecompressorReader)