getargspec not defined in Python 3.11

[pietro-butti]

When calling chisquare, the constructor calls inspect.getargspec which apparently does not work in Python 3.11

I solved the issue by changing line 172 from
args = inspect.getargspec(f)[0]
to
args = inspect.getfullargspec(f)[0]

[eibenag]

In Python 3.14, the same replacement (getargspec -> getfullargspec) must also be made in line 173