updated versions and release.notes for Gaudi v23r9

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: file:///afs/cern.ch/work/b/binet/dev/repos/gaudi-svn-mirror/Gaudi/trunk/GaudiKernel@7242 22b0f739-a4da-4a50-9948-337547c35a65