chore: bump react-i18next from 15.1.0 to 15.5.1 in /frontend/web (#409)

Bumps [react-i18next](https://github.com/i18next/react-i18next) from 15.1.0 to 15.5.1.
- [Changelog](https://github.com/i18next/react-i18next/blob/master/CHANGELOG.md)
- [Commits](https://github.com/i18next/react-i18next/compare/v15.1.0...v15.5.1)

---
updated-dependencies:
- dependency-name: react-i18next
  dependency-version: 15.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/web/package.json

@@ -25,7 +25,7 @@
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-hot-toast": "^2.5.1",
-    "react-i18next": "^15.1.0",
+    "react-i18next": "^15.5.1",
     "react-router-dom": "^7.4.1",
     "react-use": "^17.6.0",
     "tailwindcss": "^3.4.14",