I have a lambda function that was deployed using cdk, it contains several rules that runs on a schedule determined by cron expression. For example, one of them need to run according to cron(0 16 ? * MON-SAT *) during fall and according to cron(0 15 ? * MON-SAT *) during spring time. Currently we need to update the cron expression manually twice a year and we are looking for a way to automate it. How can we do it (using cdk)?