Update release notes for version 1.4.2.1

This release addresses a security vulnerability in Page Builder and recommends upgrading for impacted versions.

Author: abantecart

release_notes.txt

@@ -1,5 +1,11 @@
 AbanteCart version 1.4.2.1
 
+This release addresses a security vulnerability in Page Builder (CVE-2025-50972).
+Impacted Versions
+	All 1.4.x versions
+Is the Upgrade Required?
+	If Page Builder is enabled and actively used, upgrading is strongly recommended.
+
 Bug Fixes
 ----------
 -- Fix of critical vulnerability CVE-2025-50972