Update Helm release k8up to v4.8.1

This MR contains the following updates:

Package	Update	Change
k8up (source)	minor	4.7.0 -> 4.8.1

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Release Notes

k8up-io/k8up (k8up)

v4.8.1

Compare Source

This release contains only Helm chart changes

2 changes since k8up-4.8.0

🐛 Fixes

• fix(chart:k8up): Rename & implement grafanaDashboard.enabled (#​991)

📄 Documentation

• fix(chart:k8up): Fix outdated README (#​990)

v4.8.0

Compare Source

This release contains only Helm chart changes

4 changes since k8up-4.7.0

🚀 Features

• feat: Helm - Grafana Dashboard (#​967)
• feat: add security context for cleanup hook (#​966)
• Support setting priority class of operator in Helm chart (#​956)

📄 Documentation

• Document that server-side apply is necessary for the CRDs (#​987)

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