Bump @types/react-dom from 15.5.12 to 17.0.6

Bumps [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom) from 15.5.12 to 17.0.6.
- [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

@@ -57,7 +57,7 @@
   "devDependencies": {
     "@types/mocha": "~2.2.32",
     "@types/react": "^15.5.0",
-    "@types/react-dom": "^15.5.0",
+    "@types/react-dom": "^17.0.6",
     "@types/react-native": "^0.46.9",
     "create-react-class": "^15.6.0",
     "expect.js": "0.3.x",