verkle: fix balance bigger than 128 bits (#761)

Signed-off-by: Ignacio Hagopian <[email protected]>

Author: jsign

tests/verkle/eip6800_verkle_tree/test_verkle_from_mpt_conversion.py

@@ -24,7 +24,7 @@
 @pytest.fixture
 def pre() -> Mapping:  # noqa: D103
     return {
-        TestAddress: Account(balance=10**40),
+        TestAddress: Account(balance=2**127),
         code_address: Account(
             nonce=1,
             balance=1,