Update GITLAB_SHELL_VERSION to v5.3.0
Update GITLAB_SHELL_VERSION to v5.3.0
t-zuehlsdorff/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,dplarson/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,iiet/iiet-git,jirutka/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,dplarson/gitlabhq,dplarson/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab