chore: bump zabbix agent to 7.4.3

zabbix-agent2/Dockerfile

@@ -5,7 +5,7 @@ FROM ${BUILD_FROM}
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 ARG MAJOR_VERSION=7.4
-ARG ZABBIX_VERSION=${MAJOR_VERSION}.2
+ARG ZABBIX_VERSION=${MAJOR_VERSION}.3
 ARG ZABBIX_DEB_URL="https://repo.zabbix.com/zabbix/${MAJOR_VERSION}/release/debian/pool/main/z/zabbix-release"
 ARG ZABBIX_DEB_PKG="zabbix-release_latest_${MAJOR_VERSION}+debian12_all.deb"