chore(brew): remove [email protected]

This is ancient and I have no idea why it is in here. Removing as
suggested by `brew doctor`:

    Warning: Some installed formulae are deprecated or disabled.
    You should find replacements for the following formulae:
      [email protected]

Originally added in 715d6c1 ("brew: Update brewfile", Dec 16,
2016):

> Shamefully, I can't remember why a lot of this stuff is in here
> (probably dependencies, mostly): should go through and clean this up
> at some point.

aspects/homebrew/templates/Brewfile.erb

@@ -122,7 +122,6 @@ brew "ninja"
 brew "ocaml"
 brew "ocamlbuild"
 brew "openssl"
-brew "[email protected]"
 brew "optipng"
 brew "ossp-uuid"
 brew "pandoc"