Bump react-router-dom from 7.9.4 to 7.9.6 in /frontend (#147)

Bumps [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom) from 7.9.4 to 7.9.6.
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/main/packages/react-router-dom/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/react-router-dom@7.9.6/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: react-router-dom
  dependency-version: 7.9.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

frontend/package-lock.json

@@ -16,7 +16,7 @@
     "@tanstack/react-query": "^5.90.11",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
-    "react-router-dom": "^7.9.4"
+    "react-router-dom": "^7.9.6"
   },
   "devDependencies": {
     "@eslint/js": "^9.36.0",