Support for M1 installations of brew

[m4p]

On Apple Silicon brew installs to /opt/homebrew/bin/brew by default. This causes fetchInstalledVersion() to fail.

[nerdsupremacist]

Thanks for reporting this. I had no idea. I think we can use CLIKit's ExecutableFinder.find like we do here: https://github.com/nerdsupremacist/Graphaello/blob/develop/Sources/Graphaello/Processing/Pipeline/Component/Preparation/Implementation/BasicApolloProcessInstantiator.swift#L42

Then we don't have to hardcode any path or have special handling for Apple Sillicon

[RolandasRazma]

as a quick workaround:

$ sudo mkdir /usr/local/bin
$ cd /usr/local/bin
$ sudo ln -s /opt/homebrew/bin/brew brew