Use Ruby 2.3.1
What does this MR do?
This WIP MR will eventually introduce 2.3 as default language for GitLab CE/EE
Why was this MR needed?
@connorshea wants to be prepared for Rails 5.0, so we need Ruby > 2.2, so why not go 2.3 already?
What are the relevant issue numbers?
Closes #12507 (closed)
TODO
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CHANGELOG entry added -
Documentation created/updated -
All builds are passing -
Omnibus uses 2.3.1