Bump node-fetch and react-router-dom in /frontend

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) to 2.6.7 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 `node-fetch` from 1.7.3 to 2.6.7
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@1.7.3...v2.6.7)

Updates `react-router-dom` from 5.0.0 to 5.3.4
- [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/v5.3.4/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: react-router-dom
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>