langchain-ai/langgraph checkpointpostgres==2.0.20

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Changes since checkpointpostgres==2.0.19

• checkpoint-postgres: release 2.0.20 (#4335)
• Add delete_thread method to Checkpointer class (#4328)
• checkpoint-postgres: add deprecation warning for ShallowPostgresSaver (#4219)
• Docs fix example docs (#3971)
• Bump
• Update
• Docs: fix example (#3972)
• Lock