fix: conditionally install opcache only for PHP 8.4 and below

fix: conditionally install opcache only for PHP 8.4 and below Opcache extension is now bundled by default in PHP 8.5+, causing installation errors when attempting to install it via docker-php-ext-install. This change extracts the PHP version from the PHP_VERSION build argument and uses a case statement to conditionally include opcache only for PHP versions below 8.5.