Bump socket.io from 0.9.13 to 2.4.0 in /coder-base

Bumps [socket.io](https://github.com/socketio/socket.io) from 0.9.13 to 2.4.0.
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/main/CHANGELOG.md)
- [Commits](socketio/socket.io@0.9.13...2.4.0)

---
updated-dependencies:
- dependency-name: socket.io
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

coder-base/package.json

@@ -8,7 +8,7 @@
     "redis": "0.8.2",
     "mustache": "0.7.2",
     "consolidate": "0.8.0",
-    "socket.io": "0.9.13",
+    "socket.io": "2.4.0",
     "express-params": "0.0.3",
     "bcrypt-nodejs": "*",
     "connect": "2.14.3",