Update dependencies

[leferrad]

• SteganoGAN version or git commit: master 513912f
• Python version (output of python --version): Python 3.8.10
• Pip version (output of pip --version): pip 23.0
• PyTorch version (output of python -c "import torch; print(torch.__version__)"): 1.13.1+cu117
• Operating System: Linux 5.15.0-67-generic #74~20.04.1-Ubuntu SMP Wed Feb 22 14:52:34 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Description

Dependencies are not maintained, and therefore installation fails because of errors that were already solved with newer versions.

My suggestion is to just update the following dependencies lines:

    'scipy>=1.1.0',
    'numpy>=1.15.4',

What I Did

To make the tests work with these changes, it is only needed to update the values of bits_image to consider int() objects because of the change. So just changing to this line:

        bits_image = _image.data.int.return_value.cpu.return_value.numpy.return_value.tolist.return_value