zabbix_agentd: Update to 6.0.33 (LTS)

zabbix_agentd: Update to 6.0.33 (LTS)

- Update from version 6.0.30 to 6.0.33
- Update of rootfile not required

Bugs fixed:
- ZBX-20766: Fixed confusing port binding error message
- ZBX-24391: Fixed Zabbix agent to return net.tcp.socket.count result without error if IPv6 is disabled

Full changelogs since 6.0.30:
- https://www.zabbix.com/rn/rn6.0.31
- https://www.zabbix.com/rn/rn6.0.32
- https://www.zabbix.com/rn/rn6.0.33

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>