chore(deps): update dependency @types/react-dom to v16.9.4

Author: renovate-bot

packages/react/package.json

@@ -48,7 +48,7 @@
     "@types/jest": "24.0.11",
     "@types/prop-types": "15.7.0",
     "@types/react": "16.8.12",
-    "@types/react-dom": "16.8.3",
+    "@types/react-dom": "16.9.4",
     "apollo-cache-inmemory": "1.5.1",
     "apollo-client": "2.5.1",
     "graphql": "14.2.1",