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Description
Cherry-pick missing commit of #8047 to fix broken build.
Fix checkstyle errors.
Seems we used an older beta-tag for 0.20.0 release that still used a Kafka Streams version before the partial rollback of KIP-600. Thus, 0.20.x (that seems to depend on a different KS version including the rollback) breaks without the rollback (ie #8047) we did for 0.21.0 / 7.0.0 releases.
DO NOT SQUASH -- we should keep both commits independently for tracking.