Bump GitLab Workhorse to v8.8.0
Bump GitLab Workhorse to v8.8.0

This sanitizes some log messages to be consistent with CE.

Full list of changes:
https://gitlab.com/gitlab-org/gitlab-workhorse/blob/master/CHANGELOG

stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq