Bump react-router from 5.1.2 to 5.2.1

Bumps [react-router](https://github.com/ReactTraining/react-router) from 5.1.2 to 5.2.1.
- [Release notes](https://github.com/ReactTraining/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/main/CHANGELOG.md)
- [Commits](remix-run/react-router@v5.1.2...v5.2.1)

---
updated-dependencies:
- dependency-name: react-router
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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