Update gitlab cloud runner to 16.7
This matches the gitlab-server update 16.7.6 from the 16.6 branch
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
This matches the gitlab-server update 16.7.6 from the 16.6 branch