comps sync: replace libproxy-mozjs, add mesa-dri-drivers
    
    This pulls in comps c1393620 (replace libproxy-mozjs with
    libproxy-webkitgtk4) and 51c5c5ae (install mesa-dri-drivers by
    default). The latter probably doesn't change anything here, the
    former fixes ostree compose which has been broken for some time.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>