Bump org.apache.kafka:kafka-clients in /scala/serving (#5220)

Bumps org.apache.kafka:kafka-clients from 3.7.1 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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scala/serving/pom.xml

@@ -316,7 +316,7 @@
         <dependency>
             <groupId>org.apache.kafka</groupId>
             <artifactId>kafka-clients</artifactId>
-            <version>3.7.1</version>
+            <version>3.9.1</version>
             <scope>provided</scope>
         </dependency>
         <dependency>