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

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


Updates `react-i18next` from 15.7.3 to 16.0.0
- [Changelog](https://github.com/i18next/react-i18next/blob/master/CHANGELOG.md)
- [Commits](i18next/react-i18next@v15.7.3...v16.0.0)

---
updated-dependencies:
- dependency-name: react-i18next
  dependency-version: 16.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: i18next
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -33,7 +33,7 @@
     "i18next": "^25.5.2",
     "react": "^19.1.1",
     "react-dom": "^19.1.1",
-    "react-i18next": "^15.7.3",
+    "react-i18next": "^16.0.0",
     "swagger-ui-dist": "^5.29.0",
     "valibot": "^1.1.0",
     "vaul": "^1.1.2"