[maven-release-plugin] prepare release announcement-2.9.3

git-svn-id: https://source.sakaiproject.org/svn/announcement/branches/announcement-2.9.x@128823 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/announcement/branches/announcement-2.9.x@128825 66ffb92e-73f9-0310-93c1-f5514f145a0a
Jenkins post-build: Auto-updating master version to 2.9-SNAPSHOT for next release http://builds.sakaiproject.org:8080/job/announcement%202.9.x/

git-svn-id: https://source.sakaiproject.org/svn/announcement/branches/announcement-2.9.x@128826 66ffb92e-73f9-0310-93c1-f5514f145a0a