RFS -- ruby-cssbundling-rails

[Ananthu C V <weepingclown@disroot.org>]

Hi team,

I have packaged the cssbundling-rails gem since it is a dependency
needed by gitlab version 16.11.3. Please consider giving it a review
and uploading.

The package is available at:
- https://salsa.debian.org/ruby-team/mentors/ruby-cssbundling-rails

Best,
Ananthu