Upgrade Athenz dependencies to 1.8.29
<jna.version>4.5.2</jna.version>
<tensorflow.version>1.12.0</tensorflow.version>
<!-- Athenz dependencies. Make sure these dependencies matches those in Vespa's internal repositories -->
- <athenz.version>1.8.12</athenz.version>
+ <athenz.version>1.8.29</athenz.version>
<commons-lang.version>2.6</commons-lang.version>
<!-- WARNING: If you change curator version, you also need to update
zkfacade/src/main/java/org/apache/curator/**/package-info.java
