Temporarily revert "version up : Zope 2.12.23." in erp5 branch whose change on...

Temporarily revert "version up : Zope 2.12.23." in erp5 branch whose change on ObjectManager's behaviour breaks some ERP5 tests, that should be fixed in ERP5 side anyway.

This reverts commit 529d7892.

stack/erp5.cfg

@@ -32,7 +32,7 @@ allow-hosts =
 
 extends =
 # Exact version of Zope
-  http://svn.zope.org/repos/main/Zope/tags/2.12.23/versions.cfg
+  http://svn.zope.org/repos/main/Zope/tags/2.12.22/versions.cfg
   ../component/logrotate/buildout.cfg
   ../component/dcron/buildout.cfg
   ../component/file/buildout.cfg