stable branch FTBFS due to broken GID pinning
Type of work:
In the build log I see:
07:38:51 groupmod: GID '110' already exists [...] 07:38:51 +Debian-exim:x:103:110::/var/spool/exim4:/bin/false
So I guess
Debian-eximwas added and needs to have its GID pinned.