fix(deps): update react monorepo to v16.9.0 (#424)

Author: renovate[bot]

src/templates/React InstantSearch/package.json

@@ -10,8 +10,8 @@
   },
   "dependencies": {
     "algoliasearch": "3.30.0",
-    "react": "16.6.3",
-    "react-dom": "16.6.3",
+    "react": "16.9.0",
+    "react-dom": "16.9.0",
     "react-instantsearch-dom": "{{libraryVersion}}",
     "react-scripts": "2.1.1"
   },