Update dropbox-beta from 77.3.127 to 78.3.109 (#7615)
Update dropbox-beta from 77.3.127 to 78.3.109 (#7615)


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