Update telegram-alpha to 103950,578 (#4358)

Casks/telegram-alpha.rb

@@ -1,11 +1,11 @@
 cask 'telegram-alpha' do
-  version '103909,575'
-  sha256 '9b0dbafdca0c11ce22b75449caa456c4f118de701525634500447199400c946e'
+  version '103950,578'
+  sha256 '5e071cf195f0b5758ac84dbb4b77357b99b913776bc38d73d860259d288c0375'
 
   # hockeyapp.net/api/2/apps/6ed2ac3049e1407387c2f1ffcb74e81f was verified as official when first introduced to the cask
   url "https://rink.hockeyapp.net/api/2/apps/6ed2ac3049e1407387c2f1ffcb74e81f/app_versions/#{version.after_comma}?format=zip"
   appcast 'https://rink.hockeyapp.net/api/2/apps/6ed2ac3049e1407387c2f1ffcb74e81f',
-          checkpoint: '0f046ed3cb3c6ddfbfc553cc658d4f98095e52e7e25c5ff673986df8a4dc9760'
+          checkpoint: '9d1233e60ee29293228af66d37f8d8b09d3b093f9d0e54a2082fd71c04afa1fc'
   name 'Telegram for macOS'
   name 'Telegram Swift'
   homepage 'https://macos.telegram.org/'