Nuxeo Cloud is now using Kafka 3.4.0 for 2021 instances, and this version is also the one used in the Rainforest tests, see configuration for the environments rf-docker-2021 and rf-hf-2021
Let's use 3.4.0 in our CI.
We need to align on the Kafka Helm chart used for 2023: 26.4.3.