Bump react-router-dom from 4.1.2 to 6.21.1

Bumps [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom) from 4.1.2 to 6.21.1.
- [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@6.21.1/packages/react-router-dom)

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

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

Author: dependabot[bot]

package-lock.json

@@ -39,7 +39,7 @@
     "react-redux": "~8.1.3",
     "react-rnd": "~5.1.0",
     "react-router": "~4.1.2",
-    "react-router-dom": "~4.1.2",
+    "react-router-dom": "~6.21.1",
     "react-select": "~1.0.0-rc.5",
     "redux": "~4.2.1",
     "redux-devtools-extension": "~2.13.9",