Make :migration specs a little more robust
Make :migration specs a little more robust

E.g. https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/52873034

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