Update gcr.io/kasten-images/auth Docker tag to v6.5.13

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/auth		patch	6.5.11 -> 6.5.13
gcr.io/kasten-images/auth	ironbank-docker	patch	6.5.11 -> 6.5.13
gcr.io/kasten-images/auth	stage	patch	6.5.11 -> 6.5.13

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