release(checkpoint): 4.2.0

[Elior Nataf Lackritz (eliornl)]

Version bump only. No library code changes in this PR.

Unreleased since checkpoint==4.1.1:

• fix(checkpoint): collect writes at plain-value seed in delta channel history #8526 - collect writes at plain-value seed in delta channel history
• feat(checkpoint,checkpoint-postgres): add opt-in omit_expired to skip expired rows on read #8354 - add opt-in TTLConfig.omit_expired to skip expired rows on read

Minor rather than patch because #8354 adds a new public TTLConfig key. Note that the checkpoint-postgres half of #8354 already shipped in checkpointpostgres==3.1.1, so the currently released Postgres saver honors an option that no released langgraph-checkpoint declares. This closes that gap.

langgraph-checkpoint-postgres 3.1.2 (#8535) follows once this is live on PyPI.

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