Update zabbix/zabbix-agent2 Docker tag to v7.4.4

Author: renovate[bot]

build-images.sh

@@ -45,7 +45,7 @@ buildah config --entrypoint=/ \
     --label="org.nethserver.tcp-ports-demand=1" \
     --label="org.nethserver.rootfull=0" \
 	--label="org.nethserver.min-core=3.12.4-0" \
-    --label="org.nethserver.images=docker.io/postgres:15.14-alpine docker.io/zabbix/zabbix-server-pgsql:7.0.20-alpine docker.io/zabbix/zabbix-agent2:7.0.20-alpine docker.io/zabbix/zabbix-web-nginx-pgsql:7.0.20-alpine" \
+    --label="org.nethserver.images=docker.io/postgres:15.14-alpine docker.io/zabbix/zabbix-server-pgsql:7.0.20-alpine docker.io/zabbix/zabbix-agent2:7.4.4-alpine docker.io/zabbix/zabbix-web-nginx-pgsql:7.0.20-alpine" \
     "${container}"
 # Commit the image
 buildah commit "${container}" "${repobase}/${reponame}"