SAK-23179 update purepoms parent to 2.8.7

git-svn-id: https://source.sakaiproject.org/svn/edu-services/branches/edu-services-1.1.x@118983 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare release edu-services-1.1.7

git-svn-id: https://source.sakaiproject.org/svn/edu-services/branches/edu-services-1.1.x@118992 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/edu-services/branches/edu-services-1.1.x@118996 66ffb92e-73f9-0310-93c1-f5514f145a0a