net/kafka: Update 3.9.2 => 4.3.0

Release Announcement:
https://kafka.apache.org/blog/2026/05/22/apache-kafka-4.3.0-release-announcement/

PR: 292031
Approved by: Pavel Timofeev <timp87@gmail.com> (maintainer, tiemout 2 weeks)
Sponsored by: UNIS Labs
Co-authored-by: Pavel Timofeev <timp87@gmail.com>