Bump react-router-dom from 6.20.1 to 6.21.0

Bumps [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom) from 6.20.1 to 6.21.0.
- [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/react-router-dom@6.21.0/packages/react-router-dom)

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

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

package.json

@@ -45,7 +45,7 @@
     "react-dom": "^18.2.0",
     "react-external-link": "^2.2.0",
     "react-redux": "^9.0.2",
-    "react-router-dom": "^6.20.1",
+    "react-router-dom": "^6.21.0",
     "reactstrap": "^9.2.1",
     "redux-localstorage-simple": "^2.5.1",
     "uuid": "^9.0.1",