Security release which fixes CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-3738 and CVE-2021-23192

Changelog here

• Run sudo testparm -v and check for anomalies in the default config
• Run sudo systemctl enable --now smb ; smbclient -N -L localhost and check that the service runs and that it is possible to connect to the smb daemon
  • Look for smbd and ports 139 and 445 in sudo ss -plantu |egrep '139|445|smbd'
• Rebuild current gvfs and kio-extras (especially important if there were removals in abi_symbols)
  • Reboot and ensure that anonymous and authenticated user access works in the Dolphin (kio) and Nautilus (gvfs) file managers
• Rebuild ffmpeg and vlc (especially important if there were removals in abi_symbols)
  • Ensure that smb:// URI playback works in
    • mpv (used by GNOME MPV in Budgie and GNOME Shell)
    • smplayer (used by KDE)
    • vlc (used by MATE); note that vlc can be temperamental in this regard -- see T8538

Depends on D12264