SAK-23179 update purepoms parent to 2.8.7

git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/basiclti-1.3.x@119037 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare release basiclti-1.3.6

git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/basiclti-1.3.x@119038 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/basiclti/branches/basiclti-1.3.x@119040 66ffb92e-73f9-0310-93c1-f5514f145a0a