Bump react-router from 8.3.1 to 8.4.0

Bumps [react-router](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router) from 8.3.1 to 8.4.0.
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/main/packages/react-router/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/react-router@8.4.0/packages/react-router)

---
updated-dependencies:
- dependency-name: react-router
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -46,7 +46,7 @@
     "react-dom": "^19.2.8",
     "react-external-link": "^2.7.0",
     "react-redux": "^9.3.0",
-    "react-router": "^8.3.1",
+    "react-router": "^8.4.0",
     "redux-localstorage-simple": "^2.5.1",
     "workbox-core": "^7.4.0",
     "workbox-expiration": "^7.4.0",