Stop using chumpy

[lucasjinreal]

For python >= 3.11 chumpy would not work anymore.

chumpy/ch.py", line 1203, in _depends_on
want_out = 'out' in inspect.getargspec(func).args
^^^^^^^^^^^^^^^^^^
AttributeError: module 'inspect' has no attribute 'getargspec'. Did you mean: 'getargs'?

Any chumpy is not longer maintained.

[TannerGilbert]

If someone still needs to use this something like the following works (in ch.py):

if sys.version_info[0] <= 3 and sys.version_info[1] < 6:  # If Python version is less than 3.6
    # use getargspec
    want_out = 'out' in inspect.getargspec(func).args
else:
    # use getfullargspec
    want_out = 'out' in inspect.getfullargspec(func).args

Credit: mikigom@ceebb48