fix CI error

Author: Terji Petersen

pandas/core/arrays/categorical.py

@@ -42,10 +42,7 @@
     type_t,
 )
 from pandas.compat.numpy import function as nv
-from pandas.util._decorators import (
-    cache_readonly,
-    deprecate_kwarg,
-)
+from pandas.util._decorators import deprecate_kwarg
 from pandas.util._exceptions import find_stack_level
 from pandas.util._validators import validate_bool_kwarg