net-im/telegram-desktop: Update from 2.0.1 to 2.1.0

Changelog:

• Access a catalog of over 20,000 stickers made by professional artists from the updated Sticker Panel by clicking the '+' icon.
• Use sticker search to find the stickers you're looking for - or scroll from the latest packs all the way to the classics.
• Add explanations that appear after users respond to a quiz question.
• See how much time you have left to answer a question from @quizbot with the new countdown animation.
• Send a single 🎯 emoji to see if you hit the bullseye.

PR: 245980
Submitted by: Volodymyr Kostyrko <arcade@b1t.name>, Henry Hu <henry.hu.sh@gmail.com>