Update dependency socket.io to v2.4.0 [SECURITY]

Signed-off-by: Renovate Bot <[email protected]>

Author: renovate-bot

JavaScript/Node.JS/nodejs-chat/package.json

@@ -30,7 +30,7 @@
     "morgan": "^1.10.0",
     "passport": "^0.4.1",
     "passport-local": "^1.0.0",
-    "socket.io": "^1.7.4"
+    "socket.io": "^2.4.0"
   },
   "devDependencies": {
     "del": "^1.2.1",