[chores] Add changelog entry for openwisp#1221 fix

Related to openwisp#1221

Author: mn-ram

CHANGES.rst

@@ -4,7 +4,14 @@ Changelog
 Version 1.3.0 [unreleased]
 --------------------------
 
-Work in progress.
+Bugfixes
+~~~~~~~~
+
+- Fixed VPN peer cache desync when VPN template is removed from a device:
+  ``VpnClient`` objects are now deleted via per-instance ``delete()`` so that
+  ``post_delete`` signals fire, ensuring peer cache invalidation, certificate
+  revocation, and IP address release `#1221
+  <https://github.com/openwisp/openwisp-controller/issues/1221>`_
 
 Version 1.2.2 [2026-03-06]
 --------------------------