Update quay.io/coreos/k8s-prometheus-adapter-amd64 Docker tag to v0.8.1

This MR contains the following updates:

Package	Type	Update	Change
quay.io/coreos/k8s-prometheus-adapter-amd64	ironbank-docker	patch	v0.8.0 -> v0.8.1
quay.io/coreos/k8s-prometheus-adapter-amd64		patch	v0.8.0 -> v0.8.1
quay.io/coreos/k8s-prometheus-adapter-amd64	stage	patch	v0.8.0 -> v0.8.1

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