[8.x] Fix timezone option in schedule:list command (#40304)

* Convert timezone from string to `DateTimeZone` object and set default.

* Set order of `use` statements

Author: royvanv

src/Illuminate/Console/Scheduling/ScheduleListCommand.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Console\Scheduling;
 
 use Cron\CronExpression;
+use DateTimeZone;
 use Illuminate\Console\Command;
 use Illuminate\Support\Carbon;
 
@@ -39,7 +40,7 @@ public function handle(Schedule $schedule)
                 $event->description,
                 (new CronExpression($event->expression))
                             ->getNextRunDate(Carbon::now()->setTimezone($event->timezone))
-                            ->setTimezone($this->option('timezone', config('app.timezone')))
+                            ->setTimezone(new DateTimeZone($this->option('timezone') ?? config('app.timezone')))
                             ->format('Y-m-d H:i:s P'),
             ];
         }