Bump org.apache.kafka:kafka-clients in /modules/kafka

Bumps org.apache.kafka:kafka-clients from 3.8.0 to 4.0.0.

---
updated-dependencies:
- dependency-name: org.apache.kafka:kafka-clients
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modules/kafka/build.gradle

@@ -3,7 +3,7 @@ description = "Testcontainers :: Kafka"
 dependencies {
     api project(':testcontainers')
 
-    testImplementation 'org.apache.kafka:kafka-clients:3.8.0'
+    testImplementation 'org.apache.kafka:kafka-clients:4.0.0'
     testImplementation 'org.assertj:assertj-core:3.26.3'
     testImplementation 'com.google.guava:guava:23.0'
     testImplementation 'org.awaitility:awaitility:4.2.2'