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

Bumps org.apache.kafka:kafka-clients from 3.8.0 to 3.8.1.

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

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

Author: dependabot[bot]

modules/redpanda/build.gradle

@@ -4,7 +4,7 @@ dependencies {
     api project(':testcontainers')
     shaded 'org.freemarker:freemarker:2.3.33'
 
-    testImplementation 'org.apache.kafka:kafka-clients:3.8.0'
+    testImplementation 'org.apache.kafka:kafka-clients:3.8.1'
     testImplementation 'org.assertj:assertj-core:3.26.3'
     testImplementation 'io.rest-assured:rest-assured:5.5.0'
     testImplementation 'org.awaitility:awaitility:4.2.2'