Upgrade `gate-io-futures` into new order book update websocket channel

Looks like Tardis is using old `futures.order_book` channel for `gate-io-futures`, e.g. [2023-09-01 feed](https://api.tardis.dev/v1/data-feeds/gate-io-futures?from=2023-09-1)
According to [this article](https://www.gate.io/article/19776) it should be possible to switch into `futures.order_book_update`, similarly as is already used by Tardis for `gate-io`