Update CHANGELOG-EE.md for 13.11.2-ee

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CHANGELOG-EE.md

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+## 13.11.2 (2021-04-27)
+
+### Security (1 change)
+
+- Do not expose pull mirror username and password.
+
+
 ## 13.11.1 (2021-04-22)
 ### Fixed (2 changes)

ee/changelogs/unreleased/security-pull-mirror-token.yml

----
-title: Do not expose pull mirror username and password
-merge_request:
-author:
-type: security