Bump zookeeper from 3.4.6 to 3.4.14 in /webindex (#28)

Bumps zookeeper from 3.4.6 to 3.4.14.

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

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webindex/pom.xml

@@ -177,7 +177,7 @@
       <dependency>
         <groupId>org.apache.zookeeper</groupId>
         <artifactId>zookeeper</artifactId>
-        <version>3.4.6</version>
+        <version>3.4.14</version>
       </dependency>
       <dependency>
         <groupId>org.jsoup</groupId>