Upgrade Ruby to 2.3.5
EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3234
What does this MR do?
Update Ruby version to 2.3.5.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Review
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Has been reviewed by Backend
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together
What are the relevant issue numbers?
Part of gitlab-org/gitlab-ce#38040
Edited by Rémy Coutable