"Server refuse our key" if upterm client lost time sync

[slapsh]

If I try to start upterm client on a host with wrong time on it, I will have "Server refuse our key" message when I try to connect to it by ssh client.

How to repeat:

1. Let's break time setting on target server:

$ timedatectl set-ntp false
$ timedatectl set-time 10:00
$ timedatectl
               Local time: Mon 2023-01-16 10:00:03 UTC
               Universal time: Mon 2023-01-16 10:00:03 UTC
               RTC time: Mon 2023-01-16 10:00:03
               Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: no
              NTP service: inactive
              RTC in local TZ: no

2. Run "upterm host" command:

./upterm host
=== CYCTSSRPMHSQZIRTANAP
Command:                /bin/bash
Force Command:          n/a
Host:                   ssh://uptermd.upterm.dev:22
SSH Session:            ssh CyCTSsrPMHsqzirTanap:[email protected]

Run 'upterm session current' to display this screen again

Press <q> or <ctrl-c> to accept connections...

3. Try to connect on some host to "target server" by upterm:

$ ssh CyCTSsrPMHsqzirTanap:[email protected]
CyCTSsrPMHsqzirTanap:[email protected]: Permission denied (publickey).

As soon as we sync time on target server everything works fine