Merge pull request #436 Fix updating of expiration info from LuckySti…

…ng/patch-1

ydb/aio/credentials.py

@@ -71,7 +71,7 @@ async def _refresh(self):
         try:
             auth_metadata = await self._make_token_request()
             await self._cached_token.update(auth_metadata["access_token"])
-            self.update_expiration_info(auth_metadata)
+            self._update_expiration_info(auth_metadata)
             self.logger.info(
                 "Token refresh successful. current_time %s, refresh_in %s",
                 current_time,