ruby saas is deprecated

After `bundle install`:
```
Post-install message from sass:

Ruby Sass has reached end-of-life and should no longer be used.

* If you use Sass as a command-line tool, we recommend using Dart Sass, the new
primary implementation: https://sass-lang.com/install

* If you use Sass as a plug-in for a Ruby web framework, we recommend using the
sassc gem: https://github.com/sass/sassc-ruby#readme

* For more details, please refer to the Sass blog:
https://sass-lang.com/blog/posts/7828841
```