build(deps): bump react-i18next from 15.0.2 to 15.4.0 in /frontend

Bumps [react-i18next](https://github.com/i18next/react-i18next) from 15.0.2 to 15.4.0.
- [Changelog](https://github.com/i18next/react-i18next/blob/master/CHANGELOG.md)
- [Commits](i18next/react-i18next@v15.0.2...v15.4.0)

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

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -30,7 +30,7 @@
     "react-dom": "^18.3.1",
     "react-helmet": "^6.1.0",
     "react-dropzone": "^14.3.5",
-    "react-i18next": "^15.0.2",
+    "react-i18next": "^15.4.0",
     "react-markdown": "^9.0.1",
     "react-redux": "^8.0.5",
     "react-router-dom": "^7.1.1",