fix(deps): update dependency i18next to v25.8.20

Author: renovate[bot]

package.json

@@ -7,7 +7,7 @@
   },
   "dependencies": {
     "@react-email/components": "1.0.3",
-    "i18next": "25.7.4",
+    "i18next": "25.8.20",
     "i18next-resources-to-backend": "1.2.1",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",