chore(deps): update confluentinc/cp-kafka docker tag to v8

| datasource | package               | from  | to    |
| ---------- | --------------------- | ----- | ----- |
| docker     | confluentinc/cp-kafka | 7.9.6 | 8.2.0 |

Author: renovate[bot]

embedded-kafka/README.adoc

@@ -20,7 +20,7 @@ ToxiProxy is a great tool for simulating network conditions, meaning that you ca
 * `embedded.kafka.topicsToCreate` `(comma separated list of topic names, default is empty)`
 * `embedded.kafka.secureTopics` (subset of `embedded.kafka.topicsToCreate` that should be secured with ACLs)
 * `embedded.kafka.dockerImageVersion` `(default '7.9.6' provides Kafka 3.2.0)`
-* `embedded.kafka.dockerImage` `(default is set to 'confluentinc/cp-kafka:7.9.6')`
+* `embedded.kafka.dockerImage` `(default is set to 'confluentinc/cp-kafka:8.2.0')`
 ** Image versions on https://hub.docker.com/r/confluentinc/cp-kafka/tags[dockerhub]
 ** https://docs.confluent.io/current/installation/versions-interoperability.html#cp-and-apache-kafka-compatibility[Confluent Platform and Apache Kafka Compatibility]
 * `embedded.kafka.dockerUser` `(default 'appuser' since Confluent Platform 6.0.0)`

embedded-kafka/src/main/java/com/playtika/testcontainer/kafka/properties/KafkaConfigurationProperties.java

@@ -73,7 +73,7 @@ public KafkaConfigurationProperties() {
     public String getDefaultDockerImage() {
         // Please don`t remove this comment.
         // renovate: datasource=docker
-        return "confluentinc/cp-kafka:7.9.6";
+        return "confluentinc/cp-kafka:8.2.0";
     }
 
     @AllArgsConstructor