Merge branch 'update-87-unreleased' into 'master'

Mark 8.7.0 as released



See merge request !358

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
-v 8.7.0 (unreleased)
+v 8.7.0
   - Transactions for /internal/allowed now have an "action" tag set
   - Method instrumentation now uses Module#prepend instead of aliasing methods
   - Repository.clean_old_archives is now instrumented

CHANGELOG-EE

 Please view this file on the master branch, on stable branches it's out of date.
 
-v 8.7.0 (unreleased)
+v 8.7.0
   - Update GitLab Pages to 0.2.1: support user-defined 404 pages
   - Refactor group sync to pull access level logic to its own class. !306
   - [Elastic] Stabilize database indexer if database is inconsistent