chore(deps): update helm release longhorn to v1.5.1

This MR contains the following updates:

Package	Update	Change
longhorn (source)	minor	1.4.3 -> 1.5.1

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Release Notes

longhorn/charts (longhorn)

v1.5.1

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Longhorn is a distributed block storage system for Kubernetes.

v1.5.0

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Longhorn is a distributed block storage system for Kubernetes.

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