try fixing type annotations

Author: jorisvandenbossche

pandas/tests/extension/test_arrow.py

@@ -944,6 +944,7 @@ def _get_expected_exception(
         if op_name in ("__divmod__", "__rdivmod__"):
             return (NotImplementedError, TypeError)
 
+        exc: type[Exception] | tuple[type[Exception], ...] | None
         dtype = tm.get_dtype(obj)
         # error: Item "dtype[Any]" of "dtype[Any] | ExtensionDtype" has no
         # attribute "pyarrow_dtype"