Add huggingface_hub to project dependencies

Enables integration with Hugging Face resources for model sharing,
downloading, or uploading, supporting future enhancements that may
require access to pretrained models or datasets from the Hugging Face
Hub.

requirements.txt

@@ -4,3 +4,4 @@ keras
 tensorflow==2.19.0
 numpy
 Pillow
+huggingface_hub