Update CHANGELOG.md for 13.8.5-ee

[ci skip]

CHANGELOG.md

@@ -600,6 +600,18 @@ entry.
 - Apply new GitLab UI for buttons in pipeline schedules.
+## 13.8.5 (2021-03-04)
+
+### Security (6 changes)
+
+- Fix XSS in wiki author email and name.
+- Bump thrift gem to 0.14.0.
+- Allow only owners to manage group variables.
+- Do not store marshalled sessions ids in Redis.
+- Workhorse: prevent escaped router path traversal.
+- Fix XSS vulnerability for swagger file viewer.
+
+
 ## 13.8.4 (2021-02-11)
 ### Security (9 changes)