Update dropbox-beta to 52.3.56 (#5823)
Update dropbox-beta to 52.3.56 (#5823)


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