SAK-23179 update purepoms parent to 2.8.7

git-svn-id: https://source.sakaiproject.org/svn/entitybroker/branches/entitybroker-1.4.x@118963 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare release entitybroker-1.4.6

git-svn-id: https://source.sakaiproject.org/svn/entitybroker/branches/entitybroker-1.4.x@118964 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/entitybroker/branches/entitybroker-1.4.x@118966 66ffb92e-73f9-0310-93c1-f5514f145a0a