Update CHANGELOG.md for 12.2.4

[ci skip]

CHANGELOG.md

@@ -2,6 +2,23 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 12.2.4
+
+### Fixed (7 changes)
+
+- Add syntax highlighting for line expansion. !31821
+- Fix issuable sidebar icon on notification disabled. !32134
+- Upgrade Mermaid to v8.2.4. !32186
+- Fix Piwik not working. !32234
+- Fix snippets API not working with visibility level. !32286
+- Fix upload URLs in Markdown for users without access to project repository. !32448
+- Update Mermaid to v8.2.6. !32502
+
+### Performance (1 change)
+
+- Fix N+1 Gitaly calls in /api/v4/projects/:id/issues. !32171
+
+
 ## 12.2.3
 
 ### Security (22 changes)

changelogs/unreleased/66066-dark-theme-style-for-expansion-on-mr-diffs.yml

----
-title: Add syntax highlighting for line expansion
-merge_request: 31821
-author:
-type: fixed

changelogs/unreleased/66803-fix-uploads-relative-link-filter.yml

----
-title: Fix upload URLs in Markdown for users without access to project repository
-merge_request: 32448
-author:
-type: fixed

changelogs/unreleased/fe-fix-issuable-sidebar-icon-of-notification-disabled.yml

----
-title: Fix issuable sidebar icon on notification disabled
-merge_request: 32134
-author:
-type: fixed

changelogs/unreleased/sh-fix-nplusone-issues.yml

----
-title: Fix N+1 Gitaly calls in /api/v4/projects/:id/issues
-merge_request: 32171
-author:
-type: performance

changelogs/unreleased/sh-fix-piwik-template.yml

----
-title: Fix Piwik not working
-merge_request: 32234
-author:
-type: fixed

changelogs/unreleased/sh-fix-snippet-visibility-api.yml

----
-title: Fix snippets API not working with visibility level
-merge_request: 32286
-author:
-type: fixed

changelogs/unreleased/sh-mermaid-8-2-6.yml

----
-title: Update Mermaid to v8.2.6
-merge_request: 32502
-author:
-type: fixed

changelogs/unreleased/sh-upgrade-mermaid-8-2-4.yml

----
-title: Upgrade Mermaid to v8.2.4
-merge_request: 32186
-author:
-type: fixed