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Issue body

GraphRAG made some API changes since 1.2.0. We need to catch up with the latest version.

Also update the autogen version in the sample: https://github.com/microsoft/autogen/blob/main/python/samples/agentchat_graphrag/requirements.txt

Related: #6201