Bump org.apache.zookeeper:zookeeper (#1131)

Bumps org.apache.zookeeper:zookeeper from 3.4.14 to 3.7.2.

---
updated-dependencies:
- dependency-name: org.apache.zookeeper:zookeeper
  dependency-type: direct:production
...

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modules/distribution/src/main/lib/ahz/pom.xml

@@ -22,7 +22,7 @@
   <properties>
     <accumulo.version>2.0.1</accumulo.version>
     <hadoop.version>3.1.1</hadoop.version>
-    <zookeeper.version>3.4.14</zookeeper.version>
+    <zookeeper.version>3.7.2</zookeeper.version>
   </properties>
 
   <dependencies>