Dear iLorenzo
Thank you for reaching out to the support forums! I have taken a look at your problem and screenshot mentioned with your question.
The PHP-version of your site should be upgraded continuously by your hosting provider. This is a security measure that WordPress (and other plugins) require you to do in order to ensure your safety and the safety of your online presence.
Plugin? No, email!
Unfortunately there is no plugin that gives you the ability to upgrade your PHP-version as of this is a server-side process. I would recommend you to ask your hosting provider to upgrade their servers to the newest PHP-version. If they refuse it, I strongly recommend that you search for a new hosting provider.
I’m hoping this will solve your problem. Don’t hesitate to reply if you need further assistance.