gitlab-ci: Update image and use new runner tag
The runner tag has been changed to prevent from confusion with runners from other teams.
As of 8 April 2024, the git.seco.com instance was upgraded to the Premium version. External users and SECO customers who need access to private groups or repositories can make a request by contacting SECO support team via the ticketing platform (https://support.seco.com/).
The runner tag has been changed to prevent from confusion with runners from other teams.