Merge tag 'v6.6.1' into develop

Foundation 6.6.1 has fixes for issues introduced with 6.6
Check out the details below:

- 🐛 [#](https://github.com/foundation/foundation-sites/pull/11925) - Fix sticky breakpoint check
- 🐛 [#](https://github.com/foundation/foundation-sites/pull/11936) - Update composer.json for packagist.org
- 🐛 [#](https://github.com/foundation/foundation-sites/pull/11938) - add missing foundation.js reference comment

Thanks to the amazing people who contributed code or documentation to the 6.6.1 release. Foundation wouldn't happen without you!

* [Daniel Ruf](https://github.com/DanielRuf)
* [Kai](https://github.com/SassNinja)
* [Joe Workman](https://github.com/joeworkman)
* [phpfui](https://github.com/phpfui)