m4/python.m4: Update Python version list
m4/python.m4: Update Python version list

Thanks to Dieter Verfaillie for pointing  this out.

davibe/pygobject,davidmalcolm/pygobject,GNOME/pygobject,thiblahute/pygobject,sfeltman/pygobject,davidmalcolm/pygobject,pexip/pygobject,sfeltman/pygobject,davibe/pygobject,pexip/pygobject,GNOME/pygobject,thiblahute/pygobject,MathieuDuponchelle/pygobject,sfeltman/pygobject,davibe/pygobject,GNOME/pygobject,MathieuDuponchelle/pygobject,pexip/pygobject,thiblahute/pygobject,davibe/pygobject,MathieuDuponchelle/pygobject,davidmalcolm/pygobject