Update gcr.io/kasten-images/events Docker tag to v6.5.1

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/events		patch	6.5.0 -> 6.5.1
gcr.io/kasten-images/events	ironbank-docker	patch	6.5.0 -> 6.5.1
gcr.io/kasten-images/events	stage	patch	6.5.0 -> 6.5.1

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