Update gcr.io/kasten-images/events Docker tag to v7.5.7

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/events		patch	7.5.5 -> 7.5.7
gcr.io/kasten-images/events	ironbank-docker	patch	7.5.5 -> 7.5.7
gcr.io/kasten-images/events	stage	patch	7.5.5 -> 7.5.7

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This MR has been generated by Renovate Bot.

enabled an automatic merge when all merge checks for 7c303262 pass

mentioned in issue #74 (closed)

merged

mentioned in commit 59c5875f