Update CHANGELOG-EE.md for 13.11.1-ee

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CHANGELOG-EE.md

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+## 13.11.1 (2021-04-22)
+
+### Fixed (2 changes)
+
+- Geo - Sync incident metrics uploads. !59674
+- Fix zero count of vulnerability severity count. !59680
+
+
 ## 13.11.0 (2021-04-22)
 
 ### Removed (3 changes)

ee/changelogs/unreleased/328223-add-incident-metrics-image-to-geo-upload-types.yml

----
-title: Geo - Sync incident metrics uploads
-merge_request: 59674
-author:
-type: fixed