[dropout] Add extractor (#2045)

Authored-by: TwoThousandHedgehogs, pukkandan

yt_dlp/extractor/extractors.py

@@ -385,6 +385,10 @@ from .disney import DisneyIE
 from .dispeak import DigitallySpeakingIE
 from .doodstream import DoodStreamIE
 from .dropbox import DropboxIE
+from .dropout import (
+    DropoutSeasonIE,
+    DropoutIE
+)
 from .dw import (
     DWIE,
     DWArticleIE,