To render ReStructuredText files, the gitlab-markup gem spawns a python3
process via `Popen.open3`. If the stdout buffer exceeded the maximum
size, the pipe would be filled, causing a 60-second timeout on the
backend.

This version bump brings in the change in
https://gitlab.com/gitlab-org/gitlab-markup/-/merge_requests/23

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/13244