Update dependency express to v4.20.0 [SECURITY]

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
     "eslint": "7.28.0",
     "eslint-config-airbnb": "18.2.1",
     "eslint-plugin-react": "7.24.0",
-    "express": "4.17.1",
+    "express": "4.20.0",
     "karma": "6.3.3",
     "karma-browserify": "8.0.0",
     "karma-chai": "0.1.0",