fix(t8n): return the receipts list

Author: danceratopz

src/ethereum_spec_tools/evm_tools/t8n/t8n_types.py

@@ -350,7 +350,7 @@ def json_encode_receipts(self) -> Any:
 
             receipts_json.append(receipt_dict)
 
-            return receipt_dict
+        return receipts_json
 
     def to_json(self) -> Any:
         """Encode the result to JSON"""