Changes to Get current pool of the unconfirmed transactions pool

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

removed the required property items/inputs/items/boxId from the response with the 200 status

removed the required property items/inputs/items/spendingProof from the response with the 200 status

added ErgoTransactionOutput subschema #2 to the items/inputs/items response property allOf list for the response status 200

the response property items/id became required for the status 200

the response property items/size became required for the status 200