Update CHANGELOG.md (#7696)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: community-scripts-pr-app[bot]

CHANGELOG.md

@@ -28,6 +28,12 @@ Exercise vigilance regarding copycat or coat-tailing sites that seek to exploit
 
     - Refactor: Grist [@tremor021](https://github.com/tremor021) ([#7681](https://github.com/community-scripts/ProxmoxVE/pull/7681))
 
+### 🧰 Maintenance
+
+  - #### 📂 Github
+
+    - Improve: SECURITY.md for clarity and detail + Adding PVE9 as supported [@MickLesk](https://github.com/MickLesk) ([#7690](https://github.com/community-scripts/ProxmoxVE/pull/7690))
+
 ## 2025-09-16
 
 ### 🚀 Updated Scripts