When do we drop PHP 8.0 support?

1. PHP 8.0 will be reached EOL when v4.5.0 is released. It is not recommended to use unmaintained PHP.
   
2. If we don't drop PHP 8.0, the framework code cannot use PHP 8.1 feature at all. It is an obstacle to the framework maintenance. Also, if we support PHP 8.1 or later, we can upgrade PHPUnit to 10.
   
3. There seem to be relatively few PHP 8.0 users.
   

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper