Port gjs and polkit to mozjs78
mozjs78 has been added in e1b8bb64.
For both, polkit and gjs (the two packages needing mozjs) patches are available to upgrade to mozjs78. However, as of now these patches have not been merged yet. As soon as they have been merged, I would suggest we backport them in order to remove
main/mozjs60. This would allow us to cross two more packages of the python2 list (#11577)