Update ghcr.io/external-secrets/kubernetes-external-secrets Docker tag to v8.1.1

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/external-secrets/kubernetes-external-secrets		minor	8.0.1 -> 8.1.1
ghcr.io/external-secrets/kubernetes-external-secrets	stage	minor	8.0.1 -> 8.1.1

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