chore: Generate the JSON Schema (#617)

jsonschema/google/events/cloud/pubsub/v1/MessagePublishedData.json

@@ -25,6 +25,10 @@
         "subscription": {
           "type": "string",
           "description": "The resource name of the subscription for which this event was generated. The format of the value is `projects/{project-id}/subscriptions/{subscription-id}`."
+        },
+        "deliveryAttempt": {
+          "type": "integer",
+          "description": "The approximate number of times that Pub/Sub has attempted to deliver the associated message to a subscriber. More precisely, this is 1 + (number of NACKs) + (number of ack_deadline exceeds) for this message. Upon the first delivery of a given message, `delivery_attempt` will have a value of 1. The value is calculated at best effort and is approximate. If a DeadLetterPolicy is not set on the subscription, this will be 0."
         }
       },
       "additionalProperties": true,