sighash_type made explicit along with a bump in bitcoind version for CI testing
#415
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Since the Bitcoin Core ignores the sighash type specified inside the PSBT inputs,
sign_psbtrelied on the default value ofsighash_typewhich aligned with our requirements. bitcoin/bitcoin#22514 changed the default value fromSIGHASH_ALLtoSIGHASH_DEFAULT. Makingsighash_typeexplicit fixes the minor breaking change caused by the update in the bitcoin wallet. Note that sincesighashtypeparameter comes after thesignparameter, the value ofsignhas been set to the default value,true.Along with the fix,
bitcoindversion used in CI has been bumped from22.0to23.0.This issue closes #414.