checkpoint==2.0.16

langgraph-checkpoint 2.0.16

Summary of Changes

• Simplified message pack encoding implementation in JsonPlusSerializer for better performance #3481

Detailed Changes

langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer

• Removed encoder pool implementation in favor of direct message pack encoding, which should improve performance and reduce complexity #3481
• Updated Sequence import to use collections.abc rather than typing, aligning with modern Python typing practices #3481