Migrating from py-zabbix to python-zabbix-utils

[nsano-rururu]

Description

Since development of py-zabbix stopped in 2020, we switched to the official library python-zabbix-utils.

Checklist

• I have reviewed the contributing guidelines.
• I have included unit tests for my changes or additions.
• I have successfully run make test-docker with my changes.
• I have manually tested all relevant modes of the change in this PR.
• I have updated the documentation.
• I have updated the changelog.

Questions or Comments

[Copilot]

Pull Request Overview

This PR migrates the Zabbix alerter from the deprecated py-zabbix library to the modern zabbix-utils library (version 2.0.3+). The migration includes updating imports, class names, constructor parameters, and test expectations to align with the new library's API.

Key Changes:

• Replace py-zabbix dependency with zabbix-utils>=2.0.3 in package configuration
• Update Zabbix alerter implementation to use new API (Sender, ItemValue, parameter names)
• Update test mocks and assertions to reflect the new library structure

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
setup.py	Updated dependency from py-zabbix>=1.1.7 to zabbix-utils>=2.0.3
requirements.txt	Updated dependency from py-zabbix>=1.1.7 to zabbix-utils>=2.0.3
elastalert/alerters/zabbix.py	Migrated imports and class usage from pyzabbix (ZabbixSender, ZabbixMetric) to zabbix_utils (Sender, ItemValue); updated constructor parameter names (zabbix_server→server, zabbix_port→port)
tests/alerters/zabbix_test.py	Updated test mocks from pyzabbix.ZabbixSender.send to zabbix_utils.Sender.send; added ns field to expected metrics to match ItemValue structure

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