Update gcr.io/kasten-images/metering Docker tag to v6.0.12

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/metering	ironbank-docker	patch	6.0.11 -> 6.0.12
gcr.io/kasten-images/metering		patch	6.0.11 -> 6.0.12
gcr.io/kasten-images/metering	stage	patch	6.0.11 -> 6.0.12

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