Update dependency goharbor/harbor-registryctl to v2.6.0

This MR contains the following updates:

Package	Type	Update	Change
goharbor/harbor-registryctl	ironbank-docker	minor	v2.5.3 -> v2.6.0
goharbor/harbor-registryctl		minor	v2.5.3 -> v2.6.0
goharbor/harbor-registryctl	stage	minor	v2.5.3 -> v2.6.0

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