Bump i18next from 23.15.2 to 23.16.5 in /app/frontend (Azure-Samples#2141)

Bumps [i18next](https://github.com/i18next/i18next) from 23.15.2 to 23.16.5.
- [Release notes](https://github.com/i18next/i18next/releases)
- [Changelog](https://github.com/i18next/i18next/blob/master/CHANGELOG.md)
- [Commits](i18next/i18next@v23.15.2...v23.16.5)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

app/frontend/package-lock.json

@@ -19,7 +19,7 @@
     "@fluentui/react-icons": "^2.0.249",
     "@react-spring/web": "^9.7.3",
     "dompurify": "^3.1.6",
-    "i18next": "^23.15.2",
+    "i18next": "^23.16.5",
     "i18next-browser-languagedetector": "^8.0.0",
     "i18next-http-backend": "^2.5.2",
     "idb": "^8.0.0",