Bump react-router-dom from 6.30.4 to 6.30.6 in /frontend

Bumps [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom) from 6.30.4 to 6.30.6.
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/react-router-dom@6.30.6/packages/react-router-dom/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/react-router-dom@6.30.6/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: react-router-dom
  dependency-version: 6.30.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -38,7 +38,7 @@
         "dayjs": "^1.11.9",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
-        "react-router-dom": "^6.30.4",
+        "react-router-dom": "^6.30.6",
         "react-schedule-selector": "^3.0.2",
         "react-transition-group": "^4.4.5",
         "react-virtuoso": "^4.4.0"