Update gcr.io/kasten-images/vbrintegrationapi Docker tag to v6.5.3

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/vbrintegrationapi		patch	6.5.2 -> 6.5.3
gcr.io/kasten-images/vbrintegrationapi	ironbank-docker	patch	6.5.2 -> 6.5.3
gcr.io/kasten-images/vbrintegrationapi	stage	patch	6.5.2 -> 6.5.3

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