www/gitlab: security and bugfix update to 17.8.1

Changes: https://about.gitlab.com/releases/2025/01/22/patch-release-gitlab-17-8-1-released/
Security: 24c93a28-d95b-11ef-b6b2-2cf05da270f3
(cherry picked from commit 7f651bc7665311db049754e3f4dc159f1d1a01da)