www/gitlab: security and bugfix update to 18.1.1

Changes: https://about.gitlab.com/releases/2025/06/25/patch-release-gitlab-18-1-1-released/
MFH: 2025Q2
Security: d45dabd9-5232-11f0-9ca4-2cf05da270f3
(cherry picked from commit 74f240198a873999eb925be65284c991c40c157c)