Fixed key option changed in the kafkacat PR

Author: solsson

test/basic-with-kafkacat.yml

@@ -112,7 +112,7 @@ spec:
     spec:
       containers:
       - name: producer
-        image: solsson/kafkacat-fixedkey@sha256:c9c78aef3090519b64ecc279c06df6914c94720a27469200c079f1871b10fa8f
+        image: solsson/kafkacat-fixedkey@sha256:e23753bc0900e7b95d29f8c9cb05440eb27d854f367d407ce4ab2955093ad360
         env:
         - name: BOOTSTRAP
           value: kafka-0.broker.kafka.svc.cluster.local:9092