Update quay.io/prometheus/node-exporter Docker tag to v1.2.1

This MR contains the following updates:

Package	Type	Update	Change
quay.io/prometheus/node-exporter	ironbank-docker	patch	v1.2.0 -> v1.2.1
quay.io/prometheus/node-exporter		patch	v1.2.0 -> v1.2.1
quay.io/prometheus/node-exporter	stage	patch	v1.2.0 -> v1.2.1

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