This has probably no incidence on anything else but human-visible names
but let's fix it anyway.
Fixes: ef3091736c ("ci: use CI_PROJECT_NAME for artifacts name")
Signed-off-by: Martin Roukala (né Peres) <martin.roukala@mupuf.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32927>