www/gitlab-ce: security update to 16.8.3

Changes: https://about.gitlab.com/releases/2024/02/21/security-release-gitlab-16-9-1-released/

MFH: 2024Q1
Security: 03bf5157-d145-11ee-acee-001b217b3468
(cherry picked from commit fcba5ad028d4db07db98758525fb53929db847ca)