Updated roundcubemail packages fix security vulnerabilities

This is a security update to the stable version 1.6 of Roundcube Webmail. Fix cross-site scripting (XSS) vulnerability in handling SVG animate attributes. Reported by Valentin T. and Lutz Wolf of CrowdStrike. Fix cross-site scripting (XSS) vulnerability in handling list columns from user preferences. Reported by Huy Nguyễn Phạm Nhật. Fix command injection via crafted im_convert_path/im_identify_path on Windows. Reported by Huy Nguyễn Phạm Nhật. This version is considered stable and we recommend to update all productive installations of Roundcube 1.6.x with it. Please do backup your data before updating!