Zookeeper (on bookworm) currently depends on default-jre which in turn
depends on openjdk-17-jre. That leads to the fact that it's not
possible to have Zookeeper running on a bookworm system with another
jre than openjdk 17 (e.g. openjdk 21, temurin or similar) installed
*only*. openjdk-17-jre always needs to be installed, leading to
unnecessary packages on the system.
A possible solution might be to have the zookeeper package depend on
java-runtime instead (which is provided by default-jre as well).