chore(deps): bump react-router and react-router-dom in /frontend (#116)

Bumps [react-router](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router) to 6.30.4 and updates ancestor dependency [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom). These dependencies need to be updated together.


Updates `react-router` from 6.30.3 to 6.30.4
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/react-router@6.30.4/packages/react-router/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/react-router@6.30.4/packages/react-router)

Updates `react-router-dom` from 6.30.3 to 6.30.4
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/react-router-dom@6.30.4/packages/react-router-dom/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/react-router-dom@6.30.4/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: react-router
  dependency-version: 6.30.4
  dependency-type: indirect
- dependency-name: react-router-dom
  dependency-version: 6.30.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -29,7 +29,7 @@
     "react-dropzone": "^14.3.8",
     "react-markdown": "^10.1.0",
     "react-oidc-context": "^3.3.0",
-    "react-router-dom": "^6.21.0",
+    "react-router-dom": "^6.30.4",
     "react-spinners": "^0.17.0",
     "react-syntax-highlighter": "^16.1.0",
     "remark-gfm": "^4.0.1",