KIP-531 — Drop support for Scala 2.11 in Kafka 2.5

Accepted Kafka 2.5 Broker

Drops Scala 2.11 as a supported build target starting with Kafka 2.5, retaining only Scala 2.12 and 2.13. Scala 2.11 reached end-of-life in November 2017 and maintaining it imposes non-trivial CI/CD costs since every commit must be compiled and tested across all supported Scala versions.

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