fix event type (#1029)

Author: colerogers

src/v2/providers/alerts/alerts.ts

@@ -24,7 +24,7 @@ export type AlertEvent<T> = CloudEvent<
 >;
 
 /** @internal */
-export const eventType = 'firebase.firebasealerts.alerts.v1.published';
+export const eventType = 'google.firebase.firebasealerts.alerts.v1.published';
 
 /** The underlying alert type of the Firebase Alerts provider. */
 export type AlertType =