fix: upgrade @socket.io/postgres-adapter from 0.2.0 to 0.4.0

Snyk has created this PR to upgrade @socket.io/postgres-adapter from 0.2.0 to 0.4.0.

See this package in npm:
@socket.io/postgres-adapter

See this project in Snyk:
https://app.snyk.io/org/sammytezzy/project/26331257-1ac7-4ba7-88b9-a89690734a6e?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

examples/basic-crud-application/server-postgres-cluster/package.json

@@ -18,7 +18,7 @@
   },
   "homepage": "https://github.com/socketio/socket.io#readme",
   "dependencies": {
-    "@socket.io/postgres-adapter": "^0.2.0",
+    "@socket.io/postgres-adapter": "^0.4.0",
     "@socket.io/sticky": "^1.0.1",
     "joi": "^17.4.0",
     "pg": "^8.7.3",