Changes to GET /private/set_address_requires_security_key

the response property result/oneOf[#/components/schemas/address_book_item]/waiting_timestamp became nullable for the status 200

the response property result/oneOf[#/components/schemas/coinbase_address_book_item]/waiting_timestamp became nullable for the status 200

the result/oneOf[#/components/schemas/address_book_item]/waiting_timestamp response's property type changed from boolean to integer for status 200

the result/oneOf[#/components/schemas/coinbase_address_book_item]/waiting_timestamp response's property type changed from boolean to integer for status 200

endpoint added