Switch dockerfile to using php8.2 instead of 8.1 due to Alpine changes

[uberbrady]

Snyk wanted to auto-upgrade our version of Alpine which we use for Docker. But that seemed to break the Docker build.

It turns out that Alpine changed the php 8.1 APK to be called php81 instead of php. Switching everything to PHP v8.2 seems to restore the php command and the build works again.

[what-the-diff]

PR Summary

• Updated PHP Version
  The component that dictates the PHP version in our software was changed. The previous version was PHP 8.1, but with this update, we're now using the newer PHP 8.2. This enhancement could increase our system's overall operation speed and the tools we use to build our software might work more efficiently.

• Updated PHP Configuration File
  Further, we made a change to a configuration file (PHP.ini), essential for setting various options for our PHP environment. The path pointing to old PHP configuration (php81/php.ini) has now been updated to correspond to the new PHP version (php82/php.ini). This ensures our software runs smoothly and as intended.