Add PHP FTP ext on Docker setup

[rafaelstz]

PHP >= 8.2.15 removed the FTP extension, but Magento still requests its use for FTP configurations. So, I'm adding it to the Docker PHP 8.2 and 8.3 for new builds and upgrades.

Reference: magento/magento2#39083

[what-the-diff]

PR Summary

• Extension Addition to Dockerfiles
  The ftp extension has been added to two Dockerfiles related to PHP 8.2 and PHP 8.3. This extension allows files to be transferred between a client and servers over the Internet through the FTP protocol. As a result, the application now has an enhanced file transfer capability, which increases the range of operations it can perform. This improvement caters to the needs of some specific functionalities which require remote file operations.

[markshust]

Appreciate it! It's been a while since I've tagged a new release, so I'll rebuild the images and do this soon.