Updated GitLab configuration file

On the 3rd October 2023:

Our systems have detected that you are still using deprecated tags. As part of the decommission campaign of Docker runners executed in [1], finished recently on 2nd October 2023, we kindly ask you to stop using the docker, docker-image-build or any other deprecated tags contained in [1] as soon as possible. Please, review the .gitlab-ci.yml file configuration in your repository.

The changes in this MR apply the suggested approach described here to eliminate the docker deprecated tags.