support for sale v4r1 contract on include_on_sale field

currently this endpoint https://toncenter.com/api/v3/index.html#/nfts/api_v3_get_nft_items  supports only sale v3r3 contract.

i kindly request the toncenter team to add support for v4r1 which can be found on this link https://github.com/getgems-io/nft-contracts/tree/main/packages/contracts/nft-fixprice-sale-v4 