Update Kid3.app to v3.1.1

no, it's not related to cache and corrupted download.
as you can see above it just downloads page html instead of file, so `rm -rf "$(brew --cache)"` can't to anything with it.

`https://master-dl.sourceforge.net/project/kid3/kid3/#{version}/kid3-#{version}-Darwin.dmg` downloads file, `https://downloads.sourceforge.net/sourceforge/kid3/kid3-#{version}-Darwin.dmg` downloads html. at least in my country and with my ISP.