Add source for minify to Brewfile

What does this MR do and why?

When installing minify with Homebrew, we need to add the source "tap" since it's not in the homebrew-core repository (https://github.com/Homebrew/homebrew-core/tree/master/Aliases).

• https://github.com/tdewolff/homebrew-tap#how-do-i-install-these-formulae
• https://docs.brew.sh/Taps

Screenshots, screen recordings, or links to review app

before	after

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Check out this branch.
2. Run make setup
3. Look for Homebrew Bundle complete! 9 Brewfile dependencies now installed. at the start of the output. This shows that packages in the Brewfile installed correctly.

Merge request acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this merge request.