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 Please view this file on the master branch, on stable branches it's out of date.
+## 12.5.7
+
+- No changes.
+
 ## 12.5.6
 ### Security (2 changes)

VERSION

-12.5.7
+12.5.7-ee