Update ghcr.io/external-secrets/kubernetes-external-secrets Docker tag to v7

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/external-secrets/kubernetes-external-secrets	ironbank-docker	major	6.4.0 -> 7.2.1
ghcr.io/external-secrets/kubernetes-external-secrets		major	6.4.0 -> 7.2.1
ghcr.io/external-secrets/kubernetes-external-secrets	stage	major	6.4.0 -> 7.2.1

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