Update gcr.io/kasten-images/gateway Docker tag to v8.0.8

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/gateway		patch	8.0.7 -> 8.0.8
gcr.io/kasten-images/gateway	ironbank-docker	patch	8.0.7 -> 8.0.8
gcr.io/kasten-images/gateway	stage	patch	8.0.7 -> 8.0.8

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