Upgrade workhorse to v4.2.1

Alessio Caiazza requested to merge workhorse-4.2.1 into master

What does this MR do?

Upgrade workhorse to v4.2.1

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

We need gitlab-workhorse!259 (merged) to gather more information about some LFS outage we have on gitlab.com like gitlab-com/support-forum#3386

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Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

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