Log Message:
youtube-dl: Update to 20210124.1

Changes:
20210124
--------
Core
* Introduce --output-na-placeholder (#27896)

Extractors
* [franceculture] Make thumbnail optional (#18807)
* [franceculture] Fix extraction (#27891, #27903)
* [njpwworld] Fix extraction (#27890)
* [comedycentral] Fix extraction (#27905)
* [wat] Fix format extraction (#27901)
+ [americastestkitchen:season] Add support for seasons (#27861)
+ [trovo] Add support for trovo.live (#26125)
+ [aol] Add support for yahoo videos (#26650)
* [yahoo] Fix single video extraction
* [lbry] Unescape lbry URI (#27872)
* [9gag] Fix and improve extraction (#23022)
* [americastestkitchen] Improve metadata extraction for ATK episodes (#27860)
* [aljazeera] Fix extraction (#20911, #27779)
+ [minds] Add support for minds.com (#17934)
* [ard] Fix title and description extraction (#27761)
+ [spotify] Add support for Spotify Podcasts (#27443)