fix: correct the format for the "sink" to "uri"

Author: maxl2287

artifacts/camara-cloudevents/event-subscription-template.yaml

@@ -479,7 +479,7 @@ components:
           $ref: "#/components/schemas/Protocol"
         sink:
           type: string
-          format: url
+          format: uri
           description: The address to which events shall be delivered using the selected protocol.
           example: "https://endpoint.example.com/sink"
         types: