Fix hash of unit

Author: nielstron

test/pycardano/test_plutus.py

@@ -20,6 +20,7 @@
     plutus_script_hash,
     id_map,
     Datum,
+    Unit,
 )
 from pycardano.serialization import IndefiniteList, RawCBOR
 
@@ -208,10 +209,8 @@ def test_plutus_data_from_json_wrong_data_structure_type():
 
 def test_plutus_data_hash():
     assert (
-        bytes.fromhex(
-            "19d31e4f3aa9b03ad93b64c8dd2cc822d247c21e2c22762b7b08e6cadfeddb47"
-        )
-        == PlutusData().hash().payload
+        "923918e403bf43c34b4ef6b48eb2ee04babed17320d8d1b9ff9ad086e86f44ec"
+        == Unit().hash().payload.hex()
     )