Update quay.io/skupper/service-controller Docker tag to v1.8.0

This MR contains the following updates:

Package	Type	Update	Change
quay.io/skupper/service-controller		minor	1.7.3 -> 1.8.0
quay.io/skupper/service-controller	ironbank-docker	minor	1.7.3 -> 1.8.0
quay.io/skupper/service-controller	stage	minor	1.7.3 -> 1.8.0

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