Zope2py2 reorder versions priority

I prepare this MR on zope4py2 branch, but ideally on master branch.

With this change, most of eggs have the same version, some eggs have a higher version and only the following one has a lower version.

-typing-extensions= 4.3.0:whl
-    /.../srv/project/slapos/stack/slapos.cfg
+typing-extensions= 3.10.0.2
+    /.../srv/project/slapos/stack/erp5/ztk-versions.cfg

but it seems that this egg is not installed in ERP5 software release anyway.