net-mgmt/zabbix-proxy & net-mgmt/zabbix-agent: Update Zabbix Agent/Proxy to 7.2

[FieldofClay]

Important notices
Before you add a new report, we ask you kindly to acknowledge the following:

• I have read the contributing guide lines at https://github.com/opnsense/plugins/blob/master/CONTRIBUTING.md
• I have searched the existing issues, open and closed, and I'm convinced that mine is new.
• When the request is meant for an existing plugin, I've added its name to the title.

Is your feature request related to a problem? Please describe.
Zabbix Server 7.2 is not 100% compatible with Proxy version 7.0.

Describe the solution you'd like
Update or add new Zabbix agent/proxy plugins based on 7.2.

Describe alternatives you've considered
Unfortunately, downgrading the server to 7.0 is not a viable option.

Additional context
https://www.freshports.org/net-mgmt/zabbix72-agent/
https://www.freshports.org/net-mgmt/zabbix72-proxy/