Fix pynn brainscales

• PYTHONPATH was still wrong for pynn-brainscales (manually helped in testing :))
• PyNN 0.9.1 is somewhat too old for pynn-brainscales → adding version 0.9.5 to EBRAINS

mentioned in merge request !13 (merged)

merged

mentioned in commit c4fda649

Please check it in lab-int. Something conflicts in the environment i am not sure what (https://gitlab.ebrains.eu/akarmas/ebrains-spack-builds/-/jobs/17208) but the packages are built successfully.

Hmm, didn't trigger an update of py-pynn to a more recent version… I probably should have added a version constraint to meta-brainscales → creating pull request. (Sorry…)