Corrigir links de download dos Labs

Lista de labs a serem Corrigidos
- [ ] 4-nodes-traffic-lab
- [ ] client-lab
- [ ] discovery-lab
- [ ] discovery-lab-diode
- [ ] discovery-lab-diode-multivendor
- [ ] elk-lab
- [ ] logs-elk-multvendor
- [ ] logs-telegraf-multvendor
- [ ] monitoramento-zabbix-cisco-xrd
- [ ] monitoramento-zabbix-huwaei-vrp
- [ ] monitoramento-zabbix-multvendor
- [ ] telegraf-lab
- [ ] wrnp-lab
- [ ] zabbix-lab