Merge branch 'bw-update-glfm-markdown-gem' into 'master'

Update to 0.0.13 of gitlab-glfm-markdown gem

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144692



Merged-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Approved-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Approved-by: Max Orefice <morefice@gitlab.com>
Reviewed-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Reviewed-by: Max Orefice <morefice@gitlab.com>
Co-authored-by: Brett Walker <bwalker@gitlab.com>