ci: update VK-GL-CTS to 1.2.6.2
Updates VK-GL-CTS to 1.2.6.2.
GitLab will be down for maintenance Monday June 03, from approx 10am UTC for roughly 48 hours. This is for a major gitlab upgrade which requires a DB migration. See the tracker issue for more informations.
Updates VK-GL-CTS to 1.2.6.2.