Security updates for Friday

Security updates have been issued by Debian (asterisk, firefox-esr, php-phpseclib, phpseclib, python-django, and thunderbird), Fedora (grub2, samba, and thunderbird), Mageia (firefox, sudo, systemd, and thunderbird), Slackware (freerdp), SUSE (firefox, go1.18, go1.19, kernel, openvswitch, python-Twisted, systemd, and xen), and Ubuntu (expat, git, multipath-tools, unbound, and webkit2gtk).