Unschedule a previously scheduled cron job.
(int) $timestamp Timestamp for when to run the event.
(string) $hook Action hook, the execution of which will be unscheduled.
(array) $args Arguments to pass to the hook's callback function. Although not passed to a callback function, these arguments are used to uniquely identify the scheduled event, so they should be the same as those used when originally scheduling the event.
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