403 on Steam CDN files

[guicattani]

Hey!
Thanks for the awesome project!

Steam now returns 403 when backing up files served by its CDN.
Maybe it's related to this recent change https://steamcommunity.com/app/286160/discussions/0/4514379280328840039/

Example output:

PS D:\steam\steamapps\common\Tabletop Simulator\tts-backup-master> tts-prefetch --gamedata 'D:\steam\steamapps\common\Tabletop Simulator\Tabletop Simulator_Data' 'D:\PC\Documents\My Games\Tabletop Simulator\Mods\Workshop\260389428.json'
Prefetching assets for D:\PC\Documents\My Games\Tabletop Simulator\Mods\Workshop\260389428.json (UNO).
http://cloud-3.steamusercontent.com/ugc/947334421010973067/435DFCB83019461E528EDD8485EC54DE4C5A7CA0/ Error 403 (Forbidden)
http://cloud-3.steamusercontent.com/ugc/947334421010969528/75D5730A5E374AC767E27C4E43BBF71FB080B716/ Error 403 (Forbidden)
http://cloud-3.steamusercontent.com/ugc/947334421010968121/0F181F412E27EDA452434D3629C896B5CC62758C/ Error 403 (Forbidden)
http://cloud-3.steamusercontent.com/ugc/947334421010969528/75D5730A5E374AC767E27C4E43BBF71FB080B716/ Error 403 (Forbidden)
Prefetching D:\PC\Documents\My Games\Tabletop Simulator\Mods\Workshop\260389428.json completed.