feat: adds exception import to savings account

Author: AmiyahJo

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/SavingsAccount.java

@@ -2,6 +2,8 @@
 
 import java.util.Set;
 
+import com.codedifferently.lesson17.bank.exceptions.CheckNotAllowedException;
+
 public class SavingsAccount extends CheckingAccount {
     public SavingsAccount(String accountNumber, Set<Customer> owners, double initialBalance) {
         super(accountNumber, owners, initialBalance);