With Apache Kafka 3.3.0 the configuration for `` is marked as deprecated:
https://www.confluent.io/de-de/blog/apache-kafka-3-3-0-new-features-and-updates/

The KIP recommends for us to just remove that line:

Users that explicitly specify DefaultPartitioner or UniformStickyPartitioner would get a deprecation warning, but see no change of behavior. They would need to update the configuration correspondingly to get the updated behavior (remove partitioner.class setting and optionally set partitioner.ignore.keys to 'true' if replacing UniformStickyPartitioner).

https://cwiki.apache.org/confluence/display/KAFKA/KIP-794%3A+Strictly+Uniform+Sticky+Partitioner