Update GitLab Workhorse to v5.1.0
Update GitLab Workhorse to v5.1.0

stoplightio/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,dreampet/gitlab,iiet/iiet-git,axilleas/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,dreampet/gitlab,mmkassem/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,dreampet/gitlab,jirutka/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git