Update GitLab Workhorse to v8.6.0
What does this MR do?
Updates GitLab Workhorse to v8.6.0 to include the changes in gitlab-workhorse!370 (merged)
Workhorse release MR: gitlab-workhorse!388 (merged)
Updates GitLab Workhorse to v8.6.0 to include the changes in gitlab-workhorse!370 (merged)
Workhorse release MR: gitlab-workhorse!388 (merged)