chore(deps): update dependency graphql-subscriptions to v3

Author: renovate[bot]

demo/server/package.json

@@ -17,7 +17,7 @@
     "cors": "^2.8.5",
     "express": "^4.17.1",
     "graphql": "^16.6.0",
-    "graphql-subscriptions": "^1.2.1",
+    "graphql-subscriptions": "^3.0.0",
     "graphql-ws": "^5.5.5",
     "typescript": "^4.7.4",
     "ws": "^8.4.2"