build(deps): bump socket.io-client from 2.4.0 to 4.1.3

Bumps [socket.io-client](https://github.com/socketio/socket.io-client) from 2.4.0 to 4.1.3.
- [Release notes](https://github.com/socketio/socket.io-client/releases)
- [Changelog](https://github.com/socketio/socket.io-client/blob/master/CHANGELOG.md)
- [Commits](https://github.com/socketio/socket.io-client/compare/2.4.0...4.1.3)

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

packages/client/package.json

@@ -30,7 +30,7 @@
     "automerge": "0.14.0",
     "slate": "0.59.0",
     "slate-history": "0.58.3",
-    "socket.io-client": "^2.3.0",
+    "socket.io-client": "^4.1.3",
     "typescript": "^3.8.3"
   },
   "devDependencies": {