Keep the order of keys in cost models (#435)

Since plutus v3, sorting cost models based on the lexicographical of keys would result in wrong script data hash. We can assume the cost model from the chain context could be directly used without any sorting.

Author: cffls

pycardano/plutus.py

@@ -81,7 +81,7 @@ def to_shallow_primitive(self) -> dict:
                 cm = IndefiniteList([cost_model[k] for k in sorted(cost_model.keys())])
                 result[l_cbor] = cbor2.dumps(cm, default=default_encoder)
             else:
-                result[language] = [cost_model[k] for k in sorted(cost_model.keys())]
+                result[language] = [cost_model[k] for k in cost_model.keys()]
         return result
 
     @classmethod