Update CHANGELOG-EE.md for 13.8.2-ee

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CHANGELOG-EE.md

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+## 13.8.2 (2021-02-01)
+
+### Security (2 changes)
+
+- Remove Kubernetes IP address from error messages returned in Threat Monitoring.
+- Sanitize XSS in Epic milestone due date.
+
+
 ## 13.8.1 (2021-01-26)
 
 ### Fixed (2 changes)

ee/changelogs/unreleased/289930-fix-leaking-kubernetes-cluster-ip.yml

----
-title: Remove Kubernetes IP address from error messages returned in Threat Monitoring
-merge_request:
-author:
-type: security

ee/changelogs/unreleased/security-xss-epic-milestone.yml

----
-title: Sanitize XSS in Epic milestone due date
-merge_request:
-author:
-type: security