signal-desktop: Update to 7.3.1

**Changelog:**
- Now you can clear missed calls on your phone and the badge on the calls tab in Signal Desktop will be updated too.
- Opening large group chats is faster than ever. If you're in a group with several hundred people that likes to debate the existence of parallel universes, you now live in a timeline where it takes a lot less time to show the timeline of people talking about timelines.
- This update enables support for all of the new emoji characters in Emoji version 15.1. People keep asking us what our favorite new emoji is, but answering that question is a “lime” we won't cross.
- Your phone number will no longer be visible to anyone on the latest version of Signal unless they have it saved in their phone’s contacts. You can change this in Settings.
- You can now set and share an optional username to let people chat with you without giving them your phone number.
- A new privacy setting lets you control who can find you by your phone number on Signal.
- Video and audio playback will now pause whenever the Signal window is closed and minimized in the system tray. If you’re looking for silence, X marks the spot.
- By popular demand, emoticons like “:-)” now automatically become emoji — but if this makes you “:-(“ you can disable this feature in the “Chats” section of your Signal Desktop settings
- The default fonts for Urdu have been updated for improved readability when that language is selected (Signal Settings > Appearance > Language).

Signed-off-by: Algent Albrahimi <algent@protonmail.com>