MINOR: remove stale zk comment #29671

Job	Run time
build / Configure Workflow	2s
build / Compile and Check (Merge Ref)	7m 45s
build / Load Test Catalog	15s
build / JUnit tests Java 25 (new)	6m 46s
build / JUnit tests Java 17	2h 18m 36s
build / JUnit tests Java 17 (flaky)	6m 41s
build / JUnit tests Java 25	2h 14m 16s
build / JUnit tests Java 25 (flaky)	5m 17s
build / JUnit tests Java 17 (new)	7m 26s
build / CI checks completed	4s
build / Collate Test Catalog	18s
build / Update Test Catalog	-1s
	5h 7m 25s

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