Nothing will happen. The only concern is if you had an app that you needed to keep working. As you have no app there is nothing to worry about. If you want I can investigate further into why you received the email in the first place. In the end nothing will happen if you do nothing.
If you want me to look further into it I need a screenshot of the console, the email address you received the email on and the one you used to log into the console with. Feel free to private reply to me with that information.