Set minimal requirements to gcc13 and LCG 104
As discussed at the Gaudi Developers meeting, we (basically LHCb and ATLAS) do not require anymore support for gcc11 and LCG 103, so they can be removed from the gitlab-ci.
As discussed at the Gaudi Developers meeting, we (basically LHCb and ATLAS) do not require anymore support for gcc11 and LCG 103, so they can be removed from the gitlab-ci.