Update CHANGELOG.md for 12.3.9

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Update CHANGELOG.md for 12.3.9
e893896e · GitLab Release Tools Bot · 06767e3d · e893896e
Commit e893896e authored 5 years ago by GitLab Release Tools Bot
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
  
+## 12.3.9
+
+- No changes.
+
 ## 12.3.8
  
 - No changes.