Fix transformers-tokenizers circular dependency

- Update transformers from 4.39.0 to 4.44.0
- Resolve conflict where transformers 4.39.0 required tokenizers<0.19
- langchain-huggingface needs tokenizers>=0.19.1
- transformers 4.44.0 should support newer tokenizers versions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

requirements.txt

@@ -13,7 +13,7 @@ langchain-core==0.2.11
 langchain-huggingface==0.0.3
 sentence-transformers==2.6.0
 faiss-cpu==1.7.4
-transformers==4.39.0
+transformers==4.44.0
 torch==2.1.0
 tokenizers==0.19.1
 pydantic==2.5.0