chore(deps-dev): bump @types/react-dom from 16.9.6 to 16.9.8

Bumps [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom) from 16.9.6 to 16.9.8.
- [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

@@ -27,7 +27,7 @@
     "@types/classnames": "^2.2.10",
     "@types/d3": "^5.7.2",
     "@types/react": "^16.9.35",
-    "@types/react-dom": "^16.9.6",
+    "@types/react-dom": "^16.9.8",
     "autoprefixer": "^9.7.6",
     "babel-loader": "^8.1.0",
     "babel-preset-react-app": "^9.1.2",