chore(deps): bump org.apache.kafka:kafka-clients in /dataflow/snippets (#10103)

Bumps org.apache.kafka:kafka-clients from 3.8.0 to 3.9.1.

---
updated-dependencies:
- dependency-name: org.apache.kafka:kafka-clients
  dependency-version: 3.9.1
  dependency-type: direct:production
...

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dataflow/snippets/pom.xml

@@ -166,7 +166,7 @@
       <!-- For initializing the KafkaIO connector -->
       <groupId>org.apache.kafka</groupId>
       <artifactId>kafka-clients</artifactId>
-      <version>3.8.0</version>
+      <version>3.9.1</version>
     </dependency>
     <dependency>
       <!-- For running containerized Kafka instance in the integration test -->