Changes to List unsubscribed contacts

the data/items response's property type changed from object to no type for status 200

removed the required property data/items/email from the response with the 200 status

removed the optional property data/items/created_at from the response with the 200 status

removed the optional property data/items/first_name from the response with the 200 status

removed the optional property data/items/id from the response with the 200 status

removed the optional property data/items/ip_address from the response with the 200 status

removed the optional property data/items/last_name from the response with the 200 status

removed the optional property data/items/unsubscribed_at from the response with the 200 status

removed the optional property data/items/updated_at from the response with the 200 status

added the non-success response with the status 429

added Contact subschema #2 to the data/items response property allOf list for the response status 200