Bump org.apache.kafka:kafka-clients in /scala/serving (#5215)

Bumps org.apache.kafka:kafka-clients from 2.6.3 to 3.7.1.

---
updated-dependencies:
- dependency-name: org.apache.kafka:kafka-clients
  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>2.6.3</version>
+            <version>3.7.1</version>
             <scope>provided</scope>
         </dependency>
         <dependency>