Fix(pynn-brainscales): Enforce correct log4cxx version

The production env seems to use a newer spack repo state → log4cxx is newer than currently supported for BrainScaleS → quickfix: pin to old version.

changed target branch from master to release_v0.1_202109

mentioned in merge request !26 (merged)

mentioned in commit c5211577

merged

Hi Eric,

Success!!!
nest works as well now!!

Please test also once again that your modules work fine as this the last thing i plan on touching in light of the first release/HBP summit. This MR signals (hopefully) the launch of the first release!

Thanks a lot for the cooperation and all the great work!!

I forgot to report back → yes, everything still okay for us :D.

picked the changes into the branch cherry-pick-c5211577 with commit f2399879

mentioned in commit f2399879

mentioned in merge request !31 (merged)