Update quay.io/gatekeeper/gatekeeper-operator Docker tag to v3.18.0

[red-hat-konflux]

This PR contains the following updates:

Package	Type	Update	Change
quay.io/gatekeeper/gatekeeper-operator	Kustomization	minor	v3.17.2 -> v3.18.0

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[openshift-ci]

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[red-hat-konflux]

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