Upgrade Longhorn to chart version 1.6.1 and app version v1.6.1

No problems deploying to Proxmox VE K3s Kubernetes cluster via Helm Chart and Flux V2 reconciliation in a GitOps approach.

Helm Chart 1.5.4
Longhorn v1.5.4 release
Helm Chart 1.6.0
Longhorn v1.6.0 release
Helm Chart 1.6.1
Longhorn v1.6.1 release