Change from `mail_room` to `gitlab-mail_room`
Modify version from mail_room
0.9.1
to gitlab-mail_room
0.0.3
See:
CNG MRs gitlab-org/build/CNG!393 (merged) gitlab-org/build/CNG!395 (merged)
Omnibus MR: omnibus-gitlab!3960 (merged)
Edited by charlie ablett