www/gitlab-ce: major upgrade to 15.7.5
Changelog:
https://about.gitlab.com/releases/2022/12/22/gitlab-15-7-released/
https://about.gitlab.com/releases/2023/01/05/gitlab-15-7-1-released/
https://about.gitlab.com/releases/2023/01/09/security-release-gitlab-15-7-2-released/
https://about.gitlab.com/releases/2023/01/11/gitlab-15-7-3-released/
https://about.gitlab.com/releases/2023/01/17/critical-security-release-gitlab-15-7-5-released/