test: Remove ZooKeeper 3.9.3 (#728) #40

Job	Run time
Detect relevant changed files	4s
Build/Publish amd64 Image	6m 41s
Build/Publish arm64 Image	5m 31s
Run cargo-udeps	2m 30s
Publish/Sign 0.0.0-dev Index	32s
Package/Publish 0.0.0-dev Helm Chart	35s
Run OpenShift Preflight Check for 0.0.0-dev-arm64	18s
Run OpenShift Preflight Check for 0.0.0-dev-amd64	18s
Failure Notification	-1s
Finished Build and Publish	3s
	16m 31s

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