[BUG] Test test_pm_optimize failing on Windows due to broken pipe

[birgits]

The test test_pm_optimize is currently failing when tested on github for Windows due to a Broken Pipe error. On local machines it does however work. For now, I excluded it from the tests run on github. I tried only excluding it for Windows, but ran into another error. We should either try to change the test so that it also runs on Windows or only exclude it for Windows so it is still tested for Linux.

Status update Feb. 7, 2024 - still an issue, even with installation instructions for julia in the github action. This is the error:
edisgo\opf\powermodels_opf.py:143: BrokenPipeError