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

Author: renovate[bot]

docker-compose.yaml

@@ -45,7 +45,7 @@ services:
     ports:
       - "5672:5672/tcp"
   kafka:
-    image: confluentinc/cp-kafka:7.2.1@sha256:7494848da233258a5fae32abac99b7befee3c089b8d4da039420ac403920118b
+    image: confluentinc/cp-kafka:7.9.4@sha256:0142ea2a6606e967ac22b5d58f6ba36de3e649980e6ac723a6341fc3c0406888
     hostname: kafka
     ports:
       - "9092:9092/tcp"