Ruby2.7, Dovecot, Systemd, and more updates for Debian 11

The following security updates have been released for Debian GNU/Linux 11 (Bullseye): [SECURITY] [DLA 3858-1] ruby2.7 security update [SECURITY] [DLA 3860-1] dovecot security update [SECURITY] [DLA 3859-1] systemd security update [SECURITY] [DLA 3861-1] exfatprogs security update [SECURITY] [DLA 3863-1] nbconvert security update [SECURITY] [DLA 3865-1] frr security update [SECURITY] [DLA 3864-1] webkit2gtk security update [SECURITY] [DLA 3862-1] calibre security update

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