Bump socket.io from 2.3.0 to 2.4.0

Bumps [socket.io](https://github.com/socketio/socket.io) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/2.4.0/CHANGELOG.md)
- [Commits](socketio/socket.io@2.3.0...2.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -87,7 +87,7 @@
     "izitoast": "^1.4.0",
     "jquery": "^2.2.4",
     "moment": "^2.29.1",
-    "socket.io": "^2.1.1",
+    "socket.io": "^2.4.0",
     "utf-8-validate": "^5.0.4"
   },
   "devDependencies": {