Fix email not working in php version 8.3

I have a website made in pure php, which currently works on version 8.0 of php.
I updated to the latest version of php (8.3 php) and the whole site works correctly, except that the emails for orders with transfer payment (with card it DOES WORK) do not go away.

I think the site uses PhpMailer

I am looking for someone to correct this.
site:
https://www.fotografoguayaquil.com/galeria-deportes/galeria-deportes.php
 ... Show more