Update gcr.io/kasten-images/dashboardbff Docker tag to v6.0.11

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/dashboardbff	ironbank-docker	patch	6.0.10 -> 6.0.11
gcr.io/kasten-images/dashboardbff		patch	6.0.10 -> 6.0.11
gcr.io/kasten-images/dashboardbff	stage	patch	6.0.10 -> 6.0.11

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