Update telegram-alpha to 3.8.1-121837,981 (#5508)
Update telegram-alpha to 3.8.1-121837,981 (#5508)


caskroom/homebrew-versions,Ngrd/homebrew-versions,Ngrd/homebrew-versions,pkq/homebrew-versions,mahori/homebrew-cask-versions,404NetworkError/homebrew-versions,rogeriopradoj/homebrew-versions,pkq/homebrew-versions,caskroom/homebrew-versions,rogeriopradoj/homebrew-versions,lantrix/homebrew-versions,lantrix/homebrew-versions,victorpopkov/homebrew-versions,mahori/homebrew-versions,victorpopkov/homebrew-versions,404NetworkError/homebrew-versions