The Sun suggests that you have a desire to reconnect with this old friend and rekindle the flame of friendship. The Sun represents enlightenment and inner light, so the dream has a deep meaning. It can mean that you are trying to set things straight with yourself through this dream. So the answer to this question is "yes".
Reversed Nine of Swords indicates that the situation you are in is complicated and difficult to deal with. This card also represents some sort of fear or concern about this situation, especially about the other person's reaction. It may also indicate that there is something that needs to be resolved before contacting your friend again. So the answer to this question is "no".
Justice represents an inner strength that drives you to take action and be stronger. Inner strength can lead you to great things, like reconnecting with an old friend. This meaning can be seen as encouragement or a signal that you should contact him. So, the answer to this question is "yes".
Based on the cards drawn, it seems that the dream is a positive sign that prompts you to reconnect with your old friend. Justice and The Sun show that there is a desire to reconnect with him and to renew the friendship. On the other hand, Nine of Swords reversed shows that there may be some issues to be resolved before contacting him again. Therefore, the answer to the question is most likely "yes", but considering the orientation of the cards it would be better to take precautions before contacting him.