Update docker.io/grafana/grafana-oss Docker tag to v11.3.0

Minor update of container without any issue by means of Docker compose YAML infrastructure and automated Portainer GitOps workflow mitigating a cirtical CVE.

Also upgrading Grafana instances of Loki and kube-prometheus-stack on K3s cluster.

This MR contains the following updates:

Package Update Change
docker.io/grafana/grafana-oss minor 11.2.3-ubuntu -> 11.3.0-ubuntu

Release Notes

grafana/grafana (docker.io/grafana/grafana-oss)

v11.3.0

Compare Source

Features and enhancements
Bug fixes