Bump Ruby to 2.4.4
Required for omnibus-gitlab!2597 (merged)
- Bumps Ruby version to 2.4.4
- Drop requirement of gcc-6 from Ubuntu 18.04. Existence of this caused some gems with native extensions fail to build on Ubuntu 18.04. Dropping this requirement meant adding a minor patch to nginx, which was quite trivial.
Edited by Balasankar 'Balu' C