Same thing in sid. 4.13 version is available in git but not even packages in experimental. I did try to run git master but got:
.xsession-errors: (xfce4-session:1832): Gtk-ERROR **: 11:53:25.090: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported dmesg: Feb 11 10:18:23 ryzen5pc kernel: [ 4.070662] traps: xfce4-session[1832] trap int3 ip:7f319df1b761 sp:7fff36a01dc0 error:0 in libglib-2.0.so.0.5501.0[7f319deca000+113000] Setting export GTK_PATH=/etc/gtk-3.0 before building did not help.