Update argoproj/argocd Docker tag to v1.6.1

This MR contains the following updates:

Package	Type	Update	Change
argoproj/argocd	ironbank-docker	minor	v1.5.3 -> v1.6.1
argoproj/argocd		minor	v1.5.3 -> v1.6.1
argoproj/argocd	stage	minor	v1.5.3 -> v1.6.1

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