Update CHANGELOG-EE.md for 13.8.4-ee

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CHANGELOG-EE.md

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+## 13.8.4 (2021-02-11)
+
+### Security (1 change)
+
+- Geo: Pass GL-ID in a JWT token when proxy-push from secondary.
+
+
 ## 13.8.3 (2021-02-05)
 
 ### Fixed (2 changes)

ee/changelogs/unreleased/288799-confidential-issue.yml

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-title: 'Geo: Pass GL-ID in a JWT token when proxy-push from secondary'
-author:
-type: security