chore(deps-dev): bump @types/react-dom from 16.9.4 to 16.9.6

Bumps [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom) from 16.9.4 to 16.9.6.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-dom)

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

package.json

@@ -23,7 +23,7 @@
     "@types/classnames": "^2.2.9",
     "@types/d3": "^5.7.2",
     "@types/react": "^16.9.27",
-    "@types/react-dom": "^16.9.4",
+    "@types/react-dom": "^16.9.6",
     "autoprefixer": "^9.7.4",
     "babel-loader": "^8.0.6",
     "babel-preset-react-app": "^9.1.2",