wp-admin/includes/class-wp-upgrader.php:176Schedules the cleanup of the temporary backup directory.
protected function schedule_temp_backup_cleanup() { if ( false === wp_next_scheduled( 'wp_delete_temp_updater_backups' ) ) { wp_schedule_event( time(), 'weekly', 'wp_delete_temp_updater_backups' ); } }Introduced in 6.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-upgrader.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.