Installing the current libargon2-1 could stop you logging in.
The bug has been noted, along with workarounds.
$ LANG=C apt policy cryptsetup
cryptsetup:
Installed: 2:2.6.1-2
Candidate: 2:2.6.1-2
Version table:
*** 2:2.6.1-2 500
500 https://deb.debian.org/debian unstable/main amd64 Packages
100 /var/lib/dpkg/status