Update quay.io/jetstack/cert-manager-ctl Docker tag to v1.8.0

This MR contains the following updates:

Package	Type	Update	Change
quay.io/jetstack/cert-manager-ctl	ironbank-docker	minor	v1.7.2 -> v1.8.0
quay.io/jetstack/cert-manager-ctl		minor	v1.7.2 -> v1.8.0
quay.io/jetstack/cert-manager-ctl	stage	minor	v1.7.2 -> v1.8.0

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