Grafana k8s Monitoring (Helm Chart)

What's Changed

• Patch updates for 3.8.8 by @petewall in https://github.com/grafana/k8s-monitoring-helm/pull/2588

Full Changelog: https://github.com/grafana/k8s-monitoring-helm/compare/k8s-monitoring-3.8.7...k8s-monitoring-3.8.8