move _jwt_is_expired to utils

yt_dlp/extractor/digitalconcerthall.py

@@ -3,6 +3,7 @@ from ..networking.exceptions import HTTPError
 from ..utils import (
     ExtractorError,
     jwt_decode_hs256,
+    jwt_is_expired,
     parse_codecs,
     try_get,
     url_or_none,
@@ -86,7 +87,7 @@ class DigitalConcertHallIE(InfoExtractor):
 
     @property
     def _access_token_is_expired(self):
-        return self._jwt_is_expired(self._access_token, 30)
+        return jwt_is_expired(self._access_token, 30)
 
     def _set_access_token(self, value):
         self._access_token = value