fix(deps): update dependency react-i18next to v16

Author: renovate[bot]

package.json

@@ -28,7 +28,7 @@
     "oidc-spa": "^8.6.17",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
-    "react-i18next": "^15.6.0",
+    "react-i18next": "^16.0.0",
     "tsafe": "^1.8.12",
     "zod": "^4.1.12"
   },