Fix the "@mkozono" link on the "GitLab Security Release: 12.0.3, 11.11.5, and 11.10.8" page.
This fixes the "@mkozono" issue-reporter link on https://about.gitlab.com/blog/2019/07/03/security-release-gitlab-12-dot-0-dot-3-released/.
This fixes the "@mkozono" issue-reporter link on https://about.gitlab.com/blog/2019/07/03/security-release-gitlab-12-dot-0-dot-3-released/.