Bump socket.io from 2.2.0 to 2.4.0 in /ElectronNET.Host

Bumps [socket.io](https://github.com/socketio/socket.io) from 2.2.0 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](https://github.com/socketio/socket.io/compare/2.2.0...2.4.0)

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

ElectronNET.Host/package.json

@@ -16,7 +16,7 @@
         "electron-updater": "^4.3.5",
         "image-size": "^0.9.3",
         "portscanner": "^2.2.0",
-        "socket.io": "^2.2.0"
+        "socket.io": "^2.4.0"
     },
     "devDependencies": {
         "@types/node": "^10.17.20",