'debian/x86_64_build' job needs 'debian/x86_64_build-base' job, but 'debian/x86_64_build-base' is not in any previous stage
Fixes: f298a0e709 ("ci: make sure we evaluate the python-test rules first")
Fixes: 2c9fdaa830 ("ci: fix python-test dependency error on merge requests")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27042>