KIP-1011 — Use incrementalAlterConfigs when updating broker configs by kafka-configs.sh

Accepted Kafka 4.0 AdminProtocol

Switches `kafka-configs.sh` to use `IncrementalAlterConfigs` instead of the deprecated `AlterConfigs` RPC when modifying broker configs, ensuring per-key updates rather than full config replacement. The old `AlterConfigs` semantics require sending all configs atomically, risking accidental resets of configs not included in the request.

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