Fix Windows CI

[dyollb]

Partially fixes issue #2396

fix windows ci

• use torch==2.4.1 (see New error on windows: RuntimeError: Encountered inf in predicted array #2396 (comment)_
• activate windows action

normalize gaussian using numpy

• as noted here, normalization using torch produces 'Inf' for the test case with torch==2.4.0.
• doing the operation on the numpy array instead should not have any negative side-effects

specify folder 'nnunetv2' in pyproject.toml

• doesn't hurt. I noticed when I had temporary folders (e.g., 'venv/'), setuptools was not able to install the package properly
• add .venv/ to the gitignore file. This is a common name for a virtual environment

note: this PR does not 'fix' the issue with 2.4.0. I tried accumulating the predicted_logits in predict_from_raw_data.py using float32, which also helped. But in the end I still got a dice of 0.008