fix(fw): EOF - Fix EXCHANGE's data_portion_length (#849)

Co-authored-by: danceratopz <[email protected]>

src/ethereum_test_vm/opcode.py

@@ -5066,6 +5066,7 @@ class Opcodes(Opcode, Enum):
 
     EXCHANGE = Opcode(
         0xE8,
+        data_portion_length=1,
         data_portion_formatter=_exchange_encoder,
         stack_properties_modifier=_exchange_stack_properties_modifier,
     )