Upgrade gitlab gem to raise error for any non 2xx response status

Reuben Pereirarequested to merge
rp/upgrade-gitlab-gem into master

What does this MR do and why?

Describe in detail what your merge request does and why.

Pin the gitlab gem to a commit ref until the gem maintainers release a new version.

The pinned ref contains https://github.com/NARKOZ/gitlab/pull/640.

gitlab-com/gl-infra/delivery#2331

Author Check-list

  • Has documentation been updated?
Edited by Reuben Pereira

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