Update confluentinc/cp-zookeeper Docker tag to v7.6.1

This MR contains the following updates:

Package	Update	Change
confluentinc/cp-zookeeper	patch	7.6.0-1-ubi8 -> 7.6.1-1-ubi8
confluentinc/cp-zookeeper	patch	7.6.0 -> 7.6.1

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