Update telegram-alpha to 3.5.3-108464,681 (#4687)

Casks/telegram-alpha.rb

@@ -1,11 +1,11 @@
 cask 'telegram-alpha' do
-  version '3.5.3-108430,680'
+  version '3.5.3-108464,681'
-  sha256 'f85e77ceb2d86f6ed9c36d9c21224725a6fe8966bcd4e934cdaddd5c7e890649'
+  sha256 '043a28bb6561791b9c17b92487671ceff59fb07513612cf47401e71f055f8213'
 
   # 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: 'd5e6bab6bf84d54b66e1eec277ff0ee3426dab8a0cffb93ae1ad81096383c131'
+          checkpoint: 'f39e371a56c7e1ad383ff01d1ee48be0f64df1a1c00f832e5fa4a3e66ce8e66f'
   name 'Telegram for macOS'
   name 'Telegram Swift'
   homepage 'https://macos.telegram.org/'