Changed zabbix repo version
@alessiocurri @stephanearmanet @andersharrisson Update needed to make the role compatible with Debian 12. Zabbix repo updated from version 4 to 6.5
@alessiocurri @stephanearmanet @andersharrisson Update needed to make the role compatible with Debian 12. Zabbix repo updated from version 4 to 6.5