[RedBullTV] Parse subtitles from manifest (#2200)

Closes #2151
Authored by: Ashish0804

yt_dlp/extractor/redbulltv.py

@@ -81,12 +81,11 @@ class RedBullTVIE(InfoExtractor):
 
         title = video['title'].strip()
 
-        formats = self._extract_m3u8_formats(
+        formats, subtitles = self._extract_m3u8_formats_and_subtitles(
             'https://dms.redbull.tv/v3/%s/%s/playlist.m3u8' % (video_id, token),
             video_id, 'mp4', entry_protocol='m3u8_native', m3u8_id='hls')
         self._sort_formats(formats)
 
-        subtitles = {}
         for resource in video.get('resources', []):
             if resource.startswith('closed_caption_'):
                 splitted_resource = resource.split('_')