[BUG] Enabled proper GPU flag in pyproject.toml once Poetry is ready

[stroblme]

Describe the bug
The PR #9 actually does not fully solve the issue with Poetry and PyTorch. Original idea was to have a keyword "gpu" that can be provided as extra parameter to allow switching between CPU and GPU installation.
However, thttps://github.com/python-poetry/poetry/issues/7748 is an issue with the current version of poetry here which prevents this approach from working.
As I expect this to be fixed in the near future, I just disabled the line with the GPU source to simply un-comment it when Poetry fixes aforementioned issue.
Tmbk, toggling GPU/CPU install using the extra marker is the cleanest approach as long as no detection for GPU availability is available.

To Reproduce
Install the project