docs: update changelog

Author: kazupon

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 This changelog is generated by [GitHub Releases](https://github.com/intlify/vue-i18n/releases/tag/v9.14.2)
 
+## What's Changed
+
+### 🐛 Bug Fixes
+
+- fix: XSS vulnerability with prototype pollution on AST
+- fix: prototype pollusion on deepCopy
+
 <!-- Release notes generated using configuration in .github/release.yml at v9.14.2 -->
 
 **Full Changelog**: https://github.com/intlify/vue-i18n/compare/v9.14.1...v9.14.2