Update argo-images to v4

[gardener-ci-robot]

This PR contains the following updates:

Package	Update	Change
quay.io/argoproj/argocli	major	v3.7.15 → v4.0.8
quay.io/argoproj/argoexec	major	v3.7.15 → v4.0.8
quay.io/argoproj/workflow-controller	major	v3.7.15 → v4.0.8

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[gardener-prow]

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