Install fails - not picking up php8.3 even though it is installed.

This is a bit of a classic support request for PHP platforms. It is quite likely you have different versions of PHP for the webserver than for the CLI. Type php --version and let's see the output.

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to our policies.

you can switch php version using `update-alternatives`. If you are using nginx you may specify the version using

    location ~ \.php$ {
        fastcgi_index index.php;
        fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
   }

Thank you for contributing that tip @hoxton.