fix: typo on a field in webhook event helper (#7440)

Author: arcoraven

.changeset/itchy-pandas-punch.md

@@ -0,0 +1,5 @@
+---
+"@thirdweb-dev/service-utils": patch
+---
+
+fix: wrong casing on a field in webhook event helper

packages/service-utils/src/node/webhookProducer.ts

@@ -51,7 +51,7 @@ export class WebhookEventProducer {
       return {
         ...event,
         // Default to now.
-        created_at: event.createdAt ?? new Date(),
+        createdAt: event.createdAt ?? new Date(),
         // Default to a generated UUID.
         id: event.id ?? `evt_${createId()}`,
       };