Update pom.xml

Upgrade org.apache.zookeeper:zookeeper to version 3.4.14 to avoid vulnerability

tests/comparisonTest/opentsdb/opentsdbtest/pom.xml

@@ -267,7 +267,7 @@
         <dependency>
           <groupId>org.apache.zookeeper</groupId>
           <artifactId>zookeeper</artifactId>
-          <version>3.4.6</version>
+          <version>3.4.14</version>
           <exclusions>
             <exclusion>
               <groupId>log4j</groupId>