Dear Maintainer,

vpnc-scripts detects whether or not systemd-resolved is in use by
looking in /etc/nsswitch.conf to see if libnss-resolve is configured.
But libnss-resolve is not required in order to use systemd-resolved.

This was fixed upstream in commit 4a1bfb8 ("Detect systemd-resolved in
stub mode"), but Debian is shipping a copy from 2022. Please
either backport the fix or update the package.