Update to ytdl-commit-8a158a9

[NHK] Use new API URL
6508688e88

Closes #2337, Closes #4063

yt_dlp/extractor/_extractors.py

@@ -752,6 +752,7 @@
 from .kinopoisk import KinoPoiskIE
 from .konserthusetplay import KonserthusetPlayIE
 from .koo import KooIE
+from .kth import KTHIE
 from .krasview import KrasViewIE
 from .ku6 import Ku6IE
 from .kusi import KUSIIE