Get off of rust-bitcoincore-rpc fork

[casey]

We depend on ordinals/ord-bitcoincore-rpc#10, but I don't think we ever opened a PR to get it into rust-bitcoincore-rpc. We should open a PR, so we can get off our fork.

[gruve-p]

@casey Does it depend also on ordinals/ord-bitcoincore-rpc#5 or only on ordinals/ord-bitcoincore-rpc#10 ?

[gruve-p]

@casey rust-bitcoin/rust-bitcoincore-rpc#288 created

[raphjaph]

We off our fork now