DBZ-173 Upgraded Confluent Platform libraries
DBZ-173 Upgraded Confluent Platform libraries

Some of our test cases verify (de)serialization using the Avro Converter, which is included in the Confluent Platform. This commit upgrades the Confluent Platform to version 3.1.2, which matches Kafka 0.10.1.1.

jpechane/debezium,debezium/debezium,debezium/debezium,jpechane/debezium,debezium/debezium,jpechane/debezium,debezium/debezium,DuncanSands/debezium,adsr/debezium,jpechane/debezium