Update CHANGELOG-EE.md for 13.8.1-ee

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CHANGELOG-EE.md

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+## 13.8.1 (2021-01-26)
+
+### Fixed (2 changes)
+
+- Fix rendering of requirements page for unauthenticated users. !52069
+- Fix browser performance widget issue body. !52088
+
+
 ## 13.8.0 (2021-01-22)
 
 ### Fixed (24 changes, 3 of them are from the community)

ee/changelogs/unreleased/224603-fix-browser-performance-issue-body.yml

----
-title: Fix browser performance widget issue body
-merge_request: 52088
-author:
-type: fixed

ee/changelogs/unreleased/fix-issue-299207.yml

----
-title: Fix rendering of requirements page for unauthenticated users
-merge_request: 52069
-author:
-type: fixed