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
...

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