Strict networkx=2.3 dependency makes it difficult to use with python 3.9+

[wintergnut]

As of python 3.9, fractions.gcd(a, b) method has been removed and replaced by math.gcd(*integers). networkx==2.3 still uses fractions.gcd(a, b) and as such will throw an "ImportError: cannot import name 'gcd' from 'fractions'" error at runtime
https://stackoverflow.com/questions/66174862/import-error-cant-import-name-gcd-from-fractions

The workaround is to manually install a later version of networkx and ignore pip warnings, but ideally version requirements should be relaxed to somthing like networkx>=2.3