[skeb] Add extractor (#1916)

Fixes: https://github.com/ytdl-org/youtube-dl/issues/30287
Authored by: nao20010128nao

yt_dlp/extractor/extractors.py

@@ -1315,6 +1315,7 @@ from .simplecast import (
 )
 from .sina import SinaIE
 from .sixplay import SixPlayIE
+from .skeb import SkebIE
 from .skyit import (
     SkyItPlayerIE,
     SkyItVideoIE,