www/gitlab: security and patch update to 18.3.2
Changes: https://about.gitlab.com/releases/2025/09/10/patch-release-gitlab-18-3-2-released/
Security: 602fc0fa-8ece-11f0-9d03-2cf05da270f3
(cherry picked from commit db6bf25e2785ca5317af449b4c3e70ccf824a254)