When will be ALT-PHP 8.3 available?
Alt-php83 has been released already, you can install it:
yum install alt-php83*
There were issues with the alt-php83-pecl-ext package, it was rebuilt and now is in beta. You can wait for the stable release or install it from beta:
yum install alt-php83-pecl-ext --enablerepo=cloudlinux-updates-testing
We currently have a task to add alt-php83 to the Changelog, so it will appear there soon when the task is complete.