build(deps): bump i18next in /frontend in the i18next group

Bumps the i18next group in /frontend with 1 update: [i18next](https://github.com/i18next/i18next).


Updates `i18next` from 23.14.0 to 23.15.1
- [Release notes](https://github.com/i18next/i18next/releases)
- [Changelog](https://github.com/i18next/i18next/blob/master/CHANGELOG.md)
- [Commits](i18next/i18next@v23.14.0...v23.15.1)

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

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

frontend/package.json

@@ -34,7 +34,7 @@
     "classnames": "^2.5.1",
     "date-fns": "^3.6.0",
     "graphql": "^16.9.0",
-    "i18next": "^23.14.0",
+    "i18next": "^23.15.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-i18next": "^15.0.1",