Update CHANGELOG-EE.md for 11.11.8-ee

[ci skip]

CHANGELOG-EE.md

@@ -195,6 +195,10 @@ Please view this file on the master branch, on stable branches it's out of date.
 - Remove commit count from storage quotass.
+## 11.11.8
+
+- No changes.
+
 ## 11.11.7
 ### Security (5 changes)