Update CHANGELOG-EE.md for 12.4.2-ee

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CHANGELOG-EE.md

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+## 12.4.2
+
+### Fixed (1 change)
+
+- Fix feature flag check for productivity analytics. !19025
+
+
 ## 12.4.1
 ### Security (6 changes)

ee/changelogs/unreleased/fix-pa-feature-flag-check.yml

----
-title: Fix feature flag check for productivity analytics
-merge_request: 19025
-author:
-type: fixed