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Version bump only. No library code changes in this PR. Unreleased since `checkpointpostgres==3.1.1`: - #8535 - find plain-value seeds when walking delta history Follows `checkpoint==4.2.0`, which is already live on PyPI. No dependency change needed here, since `langgraph-checkpoint>=4.1.0,<5.0.0` already admits 4.2.0.