add use_pks

[tstannard]

• I bumped the gem version (or don't need to) 💎

What's up

pks uses enforcement_globs_ignore which bin/packs doesn't have. Now that the ZP code is using this we are failing bin/packwerk update-todo.

This pr introduces use_pks to the config so that we can use pks check in ZP CI.

How to test

1. In ZP (or whatever other repo is using packs) gemfile update path to point to your local version
2. gem 'packs', require: false, path: '../packs'
3. Add config.use_pks = true to config/packs.rb (line 9)
4. run bundle
   (verify you're pointing to your local packs with bundle show packs)
5. run bin/packs lint_package_todo_yml_files
6. 🎉 see success message!
   

set config.use_pks = false and run the commands:
(you can tell it's running packwerk by all the dots)
bin/packs check -> fails
bin/packs validate -> fails
bin/packs update -> fails

[shageman]

nit: you could remove these extra lines