ulwgl_dl_util: delete reference to requests module

ulwgl_dl_util.py

@@ -1,7 +1,6 @@
 from pathlib import Path
 from os import environ
 from tarfile import open as tar_open
-from requests import Timeout
 from typing import Dict, List, Tuple, Any, Union
 from hashlib import sha512
 from shutil import rmtree