Fix py-elephant tests stuck -> skip test_parallel
This MR aims to fix #86 (closed)
Comments were already added, but test not skipped?
# ECM (2025-02-05): also disable "test_parallel" test due to some test hang, cf. ESD issue 86
# https://gitlab.ebrains.eu/ri/tech-hub/platform/esd/ebrains-spack-builds/-/issues/86
Edited by Moritz Kern