Update dependency kafkajs to v1.15.0

Author: renovate-bot

src/streams/drivers/kafka/package.json

@@ -16,7 +16,7 @@
     "faker": "5.5.3",
     "flaverr": "1.10.0",
     "machine": "15.2.2",
-    "kafkajs": "1.12.0",
+    "kafkajs": "1.15.0",
     "rxjs": "6.6.7",
     "uuid": "8.1.0"
   }