Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/5492
Had to change this line to use `StreamingRuntimeContext.class` because the
Producer would now actually call this:
https://github.com/apache/flink/blob/96e898f2923f6b68bc845facf9c2d7ce1a951bbb/flink-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducerBaseTest.java#L100
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