Merge topic 'cxxmodules-gcc-14'

4089954595 gitlab-ci: update to GCC CI container with merged P1689R5
c2564f5916 ci: drop extra scandep source settings for GCC
ee52a02d56 ci: update GCC build to use master after P1689R5 is merged
4f0410959e GCC: add rules for scanning C++ module dependencies

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8827