Upgrade ZooKeeper 3.4.14 to 3.5.9

Multiple extension components have a dependency on ZooKeeper 3.4.14, which includes a transitive dependency on SpotBugs. The SpotBugs library is licensed under LGPL 2.1, which is not compatible with ASL 2:

https://www.apache.org/legal/resolved.html#category-x

NiFi Framework components already depend on ZooKeeper 3.5.9, so upgrading references to 3.4.14 aligns with current supported versions. Upgrading to a more recent version of ZooKeeper can be addressed in a separate issue.