Update Dockerfile to revert duplicated pip install

Dockerfile

@@ -133,8 +133,7 @@ RUN pip3 install uv && \
     fi; \
     chown -R $UID:$GID /app/backend/data/
 
-# Dependency for email message extraction
-RUN pip3 install extract_msg
+
 
 # copy embedding weight from build
 # RUN mkdir -p /root/.cache/chroma/onnx_models/all-MiniLM-L6-v2