Update dependency kubernetes-csi/external-snapshotter to v8.1.0

This MR contains the following updates:

Package	Type	Update	Change
kubernetes-csi/external-snapshotter	Kustomization	minor	v8.0.1 -> v8.1.0

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Release Notes

kubernetes-csi/external-snapshotter (kubernetes-csi/external-snapshotter)

v8.1.0

Compare Source

Overall Status

Volume snapshotting has been a GA feature since Kubernetes v1.20.

Supported CSI Spec Versions

1.0-1.9

Minimum Kubernetes version

1.25

Recommended Minimum Kubernetes version

1.25

Container

docker pull registry.k8s.io/sig-storage/snapshot-controller:v8.1.0
docker pull registry.k8s.io/sig-storage/csi-snapshotter:v8.1.0
docker pull registry.k8s.io/sig-storage/snapshot-validation-webhook:v8.1.0

Full Changelog

https://github.com/kubernetes-csi/external-snapshotter/blob/v8.1.0/CHANGELOG/CHANGELOG-8.1.md

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