Bump i18next from 23.13.0 to 23.16.4 in /services/idp

Bumps [i18next](https://github.com/i18next/i18next) from 23.13.0 to 23.16.4.
- [Release notes](https://github.com/i18next/i18next/releases)
- [Changelog](https://github.com/i18next/i18next/blob/master/CHANGELOG.md)
- [Commits](https://github.com/i18next/i18next/compare/v23.13.0...v23.16.4)

---
updated-dependencies:
- dependency-name: i18next
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

services/idp/package.json

@@ -85,7 +85,7 @@
     "@types/redux-logger": "^3.0.13",
     "axios": "^1.7.7",
     "classnames": "^2.5.1",
-    "i18next": "^23.13.0",
+    "i18next": "^23.16.4",
     "i18next-browser-languagedetector": "^7.2.1",
     "i18next-http-backend": "^2.5.2",
     "i18next-resources-to-backend": "^1.2.1",