Bump @remix-run/router and react-router-dom in /frontend

Bumps [@remix-run/router](https://github.com/remix-run/react-router/tree/HEAD/packages/router) to 1.23.3 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 `@remix-run/router` from 1.3.2 to 1.23.3
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/@remix-run/router@1.23.3/packages/router/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/@remix-run/router@1.23.3/packages/router)

Updates `react-router-dom` from 6.8.1 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: "@remix-run/router"
  dependency-version: 1.23.3
  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>

Author: dependabot[bot]

frontend/package-lock.json

@@ -24,7 +24,7 @@
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-markdown": "^7.0.1",
-    "react-router-dom": "^6.8.1",
+    "react-router-dom": "^6.30.4",
     "react-syntax-highlighter": "^15.5.0",
     "react-uuid": "^2.0.0",
     "rehype-raw": "^6.1.1",