fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - react from 16.8.2 to 16.13.0.
    See this package in NPM: https://www.npmjs.com/package/react
  - react-dom from 16.8.2 to 16.13.0.
    See this package in NPM: https://www.npmjs.com/package/react-dom

See this project in Snyk:
https://app.snyk.io/org/saiichihashimoto/project/1548d574-0290-4988-8d6a-466dde94ebb0?utm_source=github&utm_medium=upgrade-pr

test/package.json

@@ -19,8 +19,8 @@
   "dependencies": {
     "express": "^4.17.1",
     "install-local": "1.0.0",
-    "react": "^16.8.2",
-    "react-dom": "^16.8.2"
+    "react": "^16.13.0",
+    "react-dom": "^16.13.0"
   },
   "devDependencies": {
     "npm-run-all": "^4.1.5"