Security updates for Wednesday

Security updates have been issued by Debian (heimdal, openssl, shim, and xorg-server), Oracle (kernel and thunderbird), Red Hat (git, libksba, samba, and tigervnc), Scientific Linux (thunderbird), Slackware (openssl and xorg), SUSE (EternalTerminal, openssl-1_0_0, openssl-1_1, openssl-3, openssl1, polkit, and sssd), and Ubuntu (git, grunt, heimdal, openssl, openssl1.0, and xorg-server, xorg-server-hwe-18.04, xwayland).