[udemy] Update course id regex to cover v4 layout (Closes #8753, closes #8868, closes #8870)

youtube_dl/extractor/udemy.py

@@ -144,7 +144,8 @@ class UdemyIE(InfoExtractor):
         webpage = self._download_webpage(url, lecture_id)
 
         course_id = self._search_regex(
-            r'data-course-id=["\'](\d+)', webpage, 'course id')
+            (r'data-course-id=["\'](\d+)', r'"id": (\d+)'),
+            webpage, 'course id')
 
         try:
             lecture = self._download_lecture(course_id, lecture_id)