Update gefs_hrrr.py (#979)

Missing List import

Co-authored-by: Charlelie Laurent <84199758+CharlelieLrt@users.noreply.github.com>

Author: dargueso

examples/weather/corrdiff/datasets/gefs_hrrr.py

@@ -21,7 +21,7 @@
 import glob
 import logging
 import os
-from typing import Iterable, Tuple, Union
+from typing import Iterable, Tuple, Union, List
 import copy
 
 import cftime