Favor stdlib decorator

Author: bruno-f-cruz

harp/_helpers.py

@@ -9,7 +9,7 @@
 from typing import Callable, Iterable, Mapping, Optional, Protocol, Union
 
 import requests
-from harp._helpers import deprecated
+from typing_extensions import deprecated
 from numpy import dtype
 from pandas import DataFrame, Series
 from pandas._typing import Axes