chore: sync changelog

Author: kazupon

CHANGELOG.md

@@ -1,3 +1,11 @@
+# v11.1.9 (2025-07-03T07:48:17Z)
+
+This changelog is generated by [GitHub Releases](https://github.com/intlify/vue-i18n/releases/tag/v11.1.9)
+
+<!-- Release notes generated using configuration in .github/release.yml at v11.1.9 -->
+
+**Full Changelog**: https://github.com/intlify/vue-i18n/compare/v11.1.8...v11.1.9
+
 # v11.1.8 (2025-07-02T15:01:43Z)
 
 This changelog is generated by [GitHub Releases](https://github.com/intlify/vue-i18n/releases/tag/v11.1.8)