Increase kafka version in tests to 1.1.1 (#7655)

Author: Steffen Siering

testing/environments/docker/kafka/Dockerfile

@@ -4,7 +4,7 @@ ENV KAFKA_HOME /kafka
 # The advertised host is kafka. This means it will not work if container is started locally and connected from localhost to it
 ENV KAFKA_ADVERTISED_HOST kafka
 ENV KAFKA_LOGS_DIR="/kafka-logs"
-ENV KAFKA_VERSION 1.0.0
+ENV KAFKA_VERSION 1.1.1
 ENV _JAVA_OPTIONS "-Djava.net.preferIPv4Stack=true"
 ENV TERM=linux