fix deserialize typing

Author: lucassaldanha

specs/electra/validator.md

@@ -189,9 +189,9 @@ in [EIP-7685](https://eips.ethereum.org/EIPS/eip-7685). The index of each elemen
 
 ```python
 def get_execution_requests(execution_requests: list[bytes]) -> ExecutionRequests:
-    deposits = deserialize(DepositRequest, execution_requests[0])
-    withdrawals = deserialize(WithdrawalRequest, execution_requests[1])
-    consolidations = deserialize(ConsolidationRequest, execution_requests[2])
+    deposits = deserialize(List[DepositRequest, MAX_DEPOSIT_REQUESTS_PER_PAYLOAD], execution_requests[0])
+    withdrawals = deserialize(List[WithdrawalRequest, MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD], execution_requests[1])
+    consolidations = deserialize(List[ConsolidationRequest, MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD], execution_requests[2])
 
     return ExecutionRequests(deposits, withdrawals, consolidations)
 ```