automation: Update docker-monitoring_grafana Docker tag to v10.4.2

This MR contains the following updates:

Package	Update	Change
docker-monitoring_grafana	minor	10.3.3 -> 10.4.2

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roles/docker_monitoring/defaults/main.yml

@@ -26,7 +26,7 @@ docker_monitoring_influxdb_config_location: "{{ docker_monitoring_influxdb_locat
 
 docker_monitoring_grafana_domain: grafana.example.com
 # renovate: depName=docker.io/grafana/grafana
-docker_monitoring_grafana_version: 10.3.3
+docker_monitoring_grafana_version: 10.4.2
 docker_monitoring_grafana_plugins: []
 docker_monitoring_grafana_oauth:
   enabled: false