KIP-1032 — Upgrade to Jakarta and JavaEE 10 in Kafka 4.0

Accepted Kafka 4.0 ConnectBroker

Upgrades Kafka's REST API layer (Connect, broker REST endpoints) from legacy javax.* (JavaEE) packages to jakarta.* (Jakarta EE 10), enabling compatibility with Jetty 12, Spring 6, and other modern frameworks that have dropped javax support. Kafka 4.0 is a major version bump and an appropriate milestone to make this breaking package namespace change; continuing to use javax blocked dependency upgrades that delivered security fixes.

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