KIP-119 — Drop Support for Scala 2.10 in Kafka 0.11

Accepted Kafka 1.0 Client

Drops Scala 2.10 support from Kafka's build system starting with Kafka 0.11, retaining only Scala 2.11 and 2.12 cross-compilation. Scala 2.10 reached end-of-life in March 2015; maintaining it triples CI build time per PR, and library authors have already dropped 2.10 support, creating dependency resolution issues.

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