[ie, cleanup] No from stdlib imports in extractors (#8978)

yt_dlp/extractor/panopto.py

@@ -1,8 +1,8 @@
 import calendar
-import json
+import datetime
 import functools
-from datetime import datetime, timezone
-from random import random
+import json
+import random
 
 from .common import InfoExtractor
 from ..compat import (
@@ -243,7 +243,7 @@ class PanoptoIE(PanoptoBaseIE):
         invocation_id = delivery_info.get('InvocationId')
         stream_id = traverse_obj(delivery_info, ('Delivery', 'Streams', ..., 'PublicID'), get_all=False, expected_type=str)
         if invocation_id and stream_id and duration:
-            timestamp_str = f'/Date({calendar.timegm(datetime.now(timezone.utc).timetuple())}000)/'
+            timestamp_str = f'/Date({calendar.timegm(datetime.datetime.now(datetime.timezone.utc).timetuple())}000)/'
             data = {
                 'streamRequests': [
                     {
@@ -415,7 +415,7 @@ class PanoptoIE(PanoptoBaseIE):
             'cast': traverse_obj(delivery, ('Contributors', ..., 'DisplayName'), expected_type=lambda x: x or None),
             'timestamp': session_start_time - 11640000000 if session_start_time else None,
             'duration': delivery.get('Duration'),
-            'thumbnail': base_url + f'/Services/FrameGrabber.svc/FrameRedirect?objectId={video_id}&mode=Delivery&random={random()}',
+            'thumbnail': base_url + f'/Services/FrameGrabber.svc/FrameRedirect?objectId={video_id}&mode=Delivery&random={random.random()}',
             'average_rating': delivery.get('AverageRating'),
             'chapters': self._extract_chapters(timestamps),
             'uploader': delivery.get('OwnerDisplayName') or None,