Update CHANGELOG.md for 12.4.1

[ci skip]

CHANGELOG.md

@@ -2,6 +2,26 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 12.4.1
+
+### Security (14 changes)
+
+- Standardize error response when route is missing.
+- Do not display project labels that are not visible for user accessing group labels.
+- Show cross-referenced label and milestones in issues' activities only to authorized users.
+- Show cross-referenced label and milestones in issues' activities only to authorized users.
+- Analyze incoming GraphQL queries and check for recursion.
+- Disallow unprivileged users from commenting on private repository commits.
+- Don't allow maintainers of a target project to delete the source branch of a merge request from a fork.
+- Require Maintainer permission on group where project is transferred to.
+- Don't leak private members in project member autocomplete suggestions.
+- Return 404 on LFS request if project doesn't exist.
+- Mask sentry auth token in Error Tracking dashboard.
+- Fixes a Open Redirect issue in `InternalRedirect`.
+- Remove deploy access level when project/group link is deleted.
+- Sanitize all wiki markup formats with GitLab sanitization pipelines.
+
+
 ## 12.4.0
 
 ### Security (14 changes)