See https://metadata.ftp-master.debian.org/changelogs//main/s/systemd/systemd_247.3-7_changelog
> Demote systemd-timesyncd from Depends to Recommends.
>
> This avoids a dependency cycle between systemd and systemd-timesyncd and
> thus makes dist upgrades more predictable and robust.
> It also allows minimal, systemd based containers where no NTP client is
> strictly necessary.
> To ensure that systemd-timesyncd is installed in a default installation
> created by d-i, bump its priority to standard.
> (Closes: #986651, #993947)
Change-Id: I1db174936605fd1012ac54c7ee5f147e82daa619
(cherry picked from commit 18d2e57aaa)
Alexander Lutay