Update goharbor/harbor-core Docker tag to v2.12.0

This MR contains the following updates:

Package	Type	Update	Change
goharbor/harbor-core		minor	v2.11.1 -> v2.12.0
goharbor/harbor-core	ironbank-docker	minor	v2.11.1 -> v2.12.0
goharbor/harbor-core	stage	minor	v2.11.1 -> v2.12.0

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