Update GraphRAG to version 2.2.1

[Arvuno]

Summary

This PR updates GraphRAG integration to version 2.2.1 with the following changes:

• Update GraphRAG version to 2.2.1
• Use autogen-ext[graphrag] extra in requirements.txt
• Update lockfile for GraphRAG 2.2.1

Related Issue

This PR addresses GraphRAG integration fixes.

Testing

The changes have been tested with the existing test suite.

Checklist

• Tests added/updated
• Documentation updated
• No breaking changes (or documented)

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