Update CHANGELOG.md (#8754)

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

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

CHANGELOG.md

@@ -26,6 +26,7 @@ Exercise vigilance regarding copycat or coat-tailing sites that seek to exploit
 
   - #### ✨ New Features
 
+    - core: add function cleanup_lxc [@MickLesk](https://github.com/MickLesk) ([#8749](https://github.com/community-scripts/ProxmoxVE/pull/8749))
     - Asterisk: add interactive version selection to installer [@MickLesk](https://github.com/MickLesk) ([#8726](https://github.com/community-scripts/ProxmoxVE/pull/8726))
 
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