Homebrew autoremove option

[SolidRhino]

I want to suggest a new step

The option to add the autremove option for Homebrew. This can be used to remove outdated dependency.

Which tool is this about? Where is its repository?

Homebrew
https://github.com/Homebrew/brew

Which operating systems are supported by this tool?

Linux
MacOS

What should Topgrade do to figure out if the tool needs to be invoked?

It is already implemented, but the option is not available for this program.

Which exact commands should Topgrade run?

brew autoremove

[kiliantyler]

Opened a PR for this here: #1007