chore(deps): bump kubernetes-operations subchart to 1.2.8 in kube-monitoring

[christophrichtersap]

Summary

Bumps the kubernetes-operations subchart dependency in kube-monitoring from 1.2.7 to 1.2.8.

Changes in kubernetes-operations 1.2.8

• Simplified KubePodNotReady alert expression for clarity and correctness
• Updated Kubernetes health alert condition to use explicit kube_node_status_condition{condition="Ready",status="true"}==1 instead of sum by(node) pattern

Ref: cloudoperators/kubernetes-operations@cc78fc4
PR: cloudoperators/kubernetes-operations#41

Files Changed

File	Change
kube-monitoring/charts/Chart.yaml	Subchart dependency 1.2.7 → 1.2.8, chart version 10.5.2 → 10.5.3
kube-monitoring/charts/Chart.lock	Regenerated via helm dependency update
kube-monitoring/charts/charts/kubernetes-operations-1.2.8.tgz	Updated subchart archive
kube-monitoring/plugindefinition.yaml	spec.version: 11.5.5 → 11.5.6, helmChart.version: 10.5.2 → 10.5.3

Checklist

• Chart.yaml dependency version bumped
• Chart.lock regenerated via helm dependency update
• Chart version bumped (10.5.2 → 10.5.3)
• PluginDefinition version bumped (11.5.5 → 11.5.6)
• PluginDefinition helmChart.version updated (10.5.2 → 10.5.3)