views_slideshow_update_7300 unnecessarily clears the cache

During updates, views_slideshow_update_7300() clears the cache when it doesn't have to. If that's the only update it's usually not a problem, but if you have a lot of module updates at once it's possible that it will clear the cache too early, and you will run into issues where the cache is newer than the schema.

You don't have to clear the caches in update hooks, as long as there is a hook, both update.php and drush updb will clear the caches at the end of all updates.