fix act(async () => ...) problem

for testing asynchronous by
using v16.9 as a devDependency

Author: dev-javascript

package-lock.json

@@ -64,9 +64,9 @@
     "jest-extended": "^0.11.5",
     "npm-run-all": "^4.1.5",
     "prettier": "2.3.0",
-    "react": "16.8.0",
-    "react-dom": "16.8.0",
-    "react-test-renderer": "^17.0.2",
+    "react": "16.9.0",
+    "react-dom": "16.9.0",
+    "react-test-renderer": "16.9.0",
     "rollup": "^2.41.0",
     "rollup-plugin-terser": "7.0.2",
     "sass": "^1.35.2",