Update goharbor/harbor-exporter Docker tag to v2.13.0

This MR contains the following updates:

Package	Type	Update	Change
goharbor/harbor-exporter		minor	v2.12.2 -> v2.13.0
goharbor/harbor-exporter	ironbank-docker	minor	v2.12.2 -> v2.13.0
goharbor/harbor-exporter	stage	minor	v2.12.2 -> v2.13.0

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