Update quay.io/coreos/clair Docker tag to v4.1.2

This MR contains the following updates:

Package	Type	Update	Change
quay.io/coreos/clair	ironbank-docker	patch	v4.1.1 -> v4.1.2
quay.io/coreos/clair		patch	v4.1.1 -> v4.1.2
quay.io/coreos/clair	stage	patch	v4.1.1 -> v4.1.2

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