Fix ScheduleRunCommandTest on Windows by using 'cmd /c exit 0' instead of 'true' (laravel#57621)

Author: Tina-1300

tests/Integration/Console/Scheduling/ScheduleRunCommandTest.php

@@ -132,7 +132,8 @@ public function test_command_with_no_explicit_return_does_not_trigger_event()
 
         // Create a schedule and add the command that just performs an action without explicit exit
         $schedule = $this->app->make(Schedule::class);
-        $task = $schedule->exec('true')
+        $command = PHP_OS_FAMILY === 'Windows' ? 'cmd /c exit 0' : 'true';
+        $task = $schedule->exec($command)
             ->everyMinute();
 
         // Make sure it will run regardless of schedule