test: rename CTransaction .sha256 -> .txid_int for consistency

Note that we unfortunately can't use a scripted diff here, as the same
property name is also used for `CBlockHeader`/`CBlock` instances.

test/functional/feature_taproot.py

@@ -1424,7 +1424,7 @@ class TaprootTest(BitcoinTestFramework):
             fund_tx = tx_from_hex(node.signrawtransactionwithwallet(fund_tx.serialize().hex())["hex"])
             # Construct UTXOData entries
             for i in range(count_this_tx):
-                utxodata = UTXOData(outpoint=COutPoint(fund_tx.sha256, i), output=fund_tx.vout[i], spender=spenders[done])
+                utxodata = UTXOData(outpoint=COutPoint(fund_tx.txid_int, i), output=fund_tx.vout[i], spender=spenders[done])
                 if utxodata.spender.need_vin_vout_mismatch:
                     mismatching_utxos.append(utxodata)
                 else:
@@ -1648,7 +1648,7 @@ class TaprootTest(BitcoinTestFramework):
         # Construct a deterministic chain of transactions creating UTXOs to the test's spk's (so that they
         # come from distinct txids).
         txn = []
-        lasttxid = coinbase.sha256
+        lasttxid = coinbase.txid_int
         amount = 5000000000
         for i, spk in enumerate(old_spks + tap_spks):
             val = 42000000 * (i + 7)
@@ -1660,9 +1660,9 @@ class TaprootTest(BitcoinTestFramework):
                 tx.vout = list(reversed(tx.vout))
             tx.nLockTime = 0
             amount -= val
-            lasttxid = tx.sha256
+            lasttxid = tx.txid_int
             txn.append(tx)
-            spend_info[spk]['prevout'] = COutPoint(tx.sha256, i & 1)
+            spend_info[spk]['prevout'] = COutPoint(tx.txid_int, i & 1)
             spend_info[spk]['utxo'] = CTxOut(val, spk)
         # Mine those transactions
         self.init_blockinfo(self.nodes[0])