chore(rich-text-web): add changelog entry for js-beautify security update

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: iobuhov

packages/pluggableWidgets/rich-text-web/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Security
+
+- We updated `js-beautify` dependency from 1.15.4 to 2.0.3 to address security vulnerability SNYK-JS-BRACEEXPANSION-17706650.
+
 ## [4.12.0] - 2026-04-22
 
 ### Added