Update dependency i18next to v25

Author: renovate[bot]

package-lock.json

@@ -91,7 +91,7 @@
     "dotenv": "^16.4.1",
     "express": "^4.18.2",
     "express-async-errors": "^3.1.1",
-    "i18next": "^23.0.0",
+    "i18next": "^25.0.0",
     "lodash": "^4.17.21",
     "markdown-to-txt": "^2.0.1",
     "morgan": "^1.10.0",