Add latest changes from gitlab-org/gitlab@12-5-stable-ee

CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
+## 12.5.6
+
+### Security (2 changes)
+
+- Don't publish drafts if user can't create notes.
+- Remove protected tag access when group is removed.
+
+
 ## 12.5.5
 - No changes.

VERSION

-12.5.6
+12.5.6-ee