WN-singularity probe no longer works properly with Python 3.8
https://gitlab.cern.ch/etf/lhcb/-/blob/master/src/probes/WN-singularity?ref_type=heads#L41
fails on EL8/EL9 nodes because of:
$ python3 -c 'import platform; print(" ".join(platform.dist()[:2]))'
Traceback (most recent call last):
File "<string>", line 1, in <module>
AttributeError: module 'platform' has no attribute 'dist'
This is used to define a Little used variable OS_VER
, a simplified definition may be simplest to work around this.