Merge branch 'changelog-error' into 'master'

Fix lint-doc error

## What does this MR do?
Removes duplicate changelog versions to fix lint-doc error (https://gitlab.com/gitlab-org/gitlab-ce/builds/4621603)

See merge request !6623
Signed-off-by: Rémy Coutable <remy@rymai.me>

CHANGELOG

@@ -6,6 +6,7 @@ v 8.12.4 (unreleased)
   - Changed compare dropdowns to dropdowns with isolated search input. !6550
   - Fix race condition on LFS Token. !6592
   - Fix type mismatch bug when closing Jira issue. !6619
+  - Fix lint-doc error. !6623
 
 v 8.12.3
   - Update Gitlab Shell to support low IO priority for storage moves
@@ -13,6 +14,7 @@ v 8.12.3
 v 8.12.2
   - Fix Import/Export not recognising correctly the imported services.
   - Fix snippets pagination
+  - Fix "Create project" button layout when visibility options are restricted
   - Fix List-Unsubscribe header in emails
   - Fix IssuesController#show degradation including project on loaded notes
   - Fix an issue with the "Commits" section of the cycle analytics summary. !6513