feat: add PHP 8.5 support for all build variants

feat: add PHP 8.5 support for all build variants - Add PHP 8.5 to GitHub Actions workflow matrix - Update build.sh to include PHP 8.5 docker pulls and builds - Update clean.sh to remove PHP 8.5 images - Update README.md with PHP 8.5 as the latest version - Add comprehensive documentation of supported PHP versions and available tags - Move latest and latest-alpine tags from PHP 8.4 to PHP 8.5 All variants (apache-trixie, apache-bookworm, fpm-alpine) now support PHP 8.5