Installer failed to install `libdatetime-format-iso8601-perl`

[sbts]

Describe the bug
Installer failed to install libdatetime-format-iso8601-perl resulting in the systemd service failing to start LedgerSMB

On which operating system
Linux

If Linux, which distribution
Debian

How did you invoke the installer (full installer command line)
./ledgersmb-installer install

To Reproduce
Steps to reproduce the behavior:

1. run the installer
2. copy the sample ledgersmb_starman.service file into /etc/systemd/system/ledgersmb-starman.service
3. Edit the file to set the working directory to /srv/lsmb
   NOTE: the installation was copied from ~/ledgersmb to /srv/lsmb
4. start the service
5. check journalctl logs, see that the service failed

ledgersmb-server.psgi: Can't locate DateTime/Format/Duration/ISO8601.pm in @INC (you may need to install the DateTime::Format::Duration::ISO8601 module) (@INC entries checked: /srv/lsmb/bin/.. lib old/lib /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.40.1 /usr/local/share/perl/5.40.1 /usr/lib/x86_64-linux-gnu/perl5/5.40 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl-base /usr/lib/x86_64-linux-gnu/perl/5.40 /usr/share/perl/5.40 /usr/local/lib/site_perl) at lib/LedgerSMB.pm line 260.

Expected behavior
Service to start without errors

Additional context
There are additional issues with the sample service.
Tickets will be raised over the next couple of days