Update Dockerfile

Dockerfile

@@ -13,6 +13,7 @@ WORKDIR backend/
 
 # Install requirements.txt 
 RUN pip install --no-cache-dir --upgrade -r ./requirements.txt
+RUN pip install pydantic[email]
 
 # Start the FastAPI app on port 7860, the default port expected by Spaces
 CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]