chore(deps): update confluentinc/cp-kafka docker tag to v7.9.4 (#521)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docker-compose.yml

@@ -1,7 +1,7 @@
 version: "3.9"
 services:
   kafka:
-    image: confluentinc/cp-kafka:7.9.2
+    image: confluentinc/cp-kafka:7.9.4
     ports:
       - "9092:9092"
       - "9101:9101"