WARNING: MAJOR (BREAKING) CHANGE: Update Kafka to v4

Author: renovatebot-confluentinc[bot]

pom.xml

@@ -90,7 +90,7 @@
 
         <!-- core -->
         <slf4j.version>2.0.13</slf4j.version>
-        <kafka.version>3.9.1</kafka.version>
+        <kafka.version>4.2.0</kafka.version>
         <version.unij>0.1.3</version.unij>
 
         <!-- tests -->