[EE] Upgrade `gitlab-markup` to 1.7.0
What does this MR do?
EE Backport from: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26246
What are the relevant issue numbers?
gitlab-ce#59062
EE Backport from: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26246
gitlab-ce#59062