Update gcr.io/kasten-images/controllermanager Docker tag to v7.0.2

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/controllermanager		patch	7.0.1 -> 7.0.2
gcr.io/kasten-images/controllermanager	ironbank-docker	patch	7.0.1 -> 7.0.2
gcr.io/kasten-images/controllermanager	stage	patch	7.0.1 -> 7.0.2

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