gitlab-ruby: bump bundler version
What does this MR do?
Bump bundler to latest as of 2020-06-02, per need in https://gitlab.com/gitlab-org/charts/gitlab/-/issues/2752
Checklist
See Definition of done.
For anything in this list which will not be completed, please provide a reason in the MR discussion
Required
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Merge Request Title, and Description are up to date, accurate, and descriptive -
MR targeting the appropriate branch -
MR has a green pipeline on GitLab.com
Expected (please provide an explanation if not completing)
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Test plan indicating conditions for success has been posted and passes -
Documentation created/updated -
Integration tests added to GitLab QA -
The impact any change in container size has should be evaluated
Edited by Jason Plum