fix(charts): update helm release velero to v7.1.5

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
velero (source)	patch	7.1.4 -> 7.1.5

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Release Notes

vmware-tanzu/helm-charts (velero)

### [`v7.1.5`](https://togithub.com/vmware-tanzu/helm-charts/releases/tag/velero-7.1.5) [Compare Source](https://togithub.com/vmware-tanzu/helm-charts/compare/velero-7.1.4...velero-7.1.5) A Helm chart for velero

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[github-actions[bot]]

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