net-mgmt/zabbix4-*: Update to 4.0.24

Changelog: https://www.zabbix.com/rn/rn4.0.23

		https://www.zabbix.com/rn/rn4.0.24

PR: 249020
Approved by: Pakhom Golynga <pg@pakhom.spb.ru> (maintainer)
MFH: 2020Q3 (blanket: bugfix release)