Update bitnami/zookeeper Docker tag to v3.9.3

This MR contains the following updates:

Package	Type	Update	Change
bitnami/zookeeper		patch	3.9.2 -> 3.9.3
bitnami/zookeeper	ironbank-docker	patch	3.9.2 -> 3.9.3
bitnami/zookeeper	stage	patch	3.9.2 -> 3.9.3

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