SAK-22179 update purepoms parent to 2.8.6

git-svn-id: https://source.sakaiproject.org/svn/content-review/branches/contentreview-2.8.x@118968 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare release contentreview-2.8.8

git-svn-id: https://source.sakaiproject.org/svn/content-review/branches/contentreview-2.8.x@118970 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/content-review/branches/contentreview-2.8.x@118972 66ffb92e-73f9-0310-93c1-f5514f145a0a