ci: update payload size for the event-dispatch-contract script

The payload size of the `event-dispatch-contract.min.js` script was reduced by more than 5%, which triggered CI checks. This commit updates a golden file to match the actual size.

goldens/size-tracking/integration-payloads.json

@@ -56,7 +56,7 @@
     "uncompressed": {
       "main": 207890,
       "polyfills": 33807,
-      "event-dispatch-contract.min": 704
+      "event-dispatch-contract.min": 648
     }
   }
 }