[iot-ingestion-manager] Check Avro version

Check version of AVRO library in use.
In iot_ingestion_manager/project/Versions.scala we have:

> val avroVersion = "1.7.5"

Looking at http://avro.apache.org/docs/, it seems an old version (2013).
Perhaps it is better to update the dependency to the current version (1.8.2).

Start with iot_ingestion_manager/project/Versions.scala and inspect the current Avro dependency version. Check the Apache Avro documentation for compatibility considerations before deciding whether to update from 1.7.5 to 1.8.2. Done means the dependency is verified or updated appropriately and the project still builds and passes its tests.

Written by the indexing model from the issue text.