Update CHANGELOG-EE.md for 12.8.2-ee

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CHANGELOG-EE.md

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+## 12.8.2
+
+### Security (5 changes)
+
+- Don't show Contribution Analytics to users who are not group members.
+- Update epic tree when group is transfered.
+- Fix Service Side Request Forgery in JenkinsDeprecatedService.
+- Enforce vulnerability feedback pipeline is in the same project.
+- Enforce existing vulnerability feedback pipeline is in the same project.
+
+
 ## 12.8.1
 
 ### Performance (1 change)

ee/changelogs/unreleased/security-ag-contribution-analytics.yml

----
-title: Don't show Contribution Analytics to users who are not group members
-merge_request:
-author:
-type: security

ee/changelogs/unreleased/security-epic-groups.yml

----
-title: Update epic tree when group is transfered
-merge_request:
-author:
-type: security

ee/changelogs/unreleased/security-sh-fix-jenkins-deprecated-service-ssrf.yml

----
-title: Fix Service Side Request Forgery in JenkinsDeprecatedService
-merge_request:
-author:
-type: security

ee/changelogs/unreleased/security-vuln-feedback-pipeline.yml

----
-title: Enforce vulnerability feedback pipeline is in the same project
-merge_request:
-author:
-type: security

ee/changelogs/unreleased/security-vuln-w-existing-feedback-pipeline.yml

----
-title: Enforce existing vulnerability feedback pipeline is in the same project
-merge_request:
-author:
-type: security