Use gitlab-workhorse 3.1.0
What does this MR do?
Update the required version of gitlab-workhorse to 3.1.0.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
To ship recent changes in gitlab-workhorse in 10.1.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together