future.standard_library breaking python 3.12 compatibility

[boatmorrow]

future.standard_library imports the imp module which is gone in python 3.12. So, future.standard_library is not really python 3.12 compatible.

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This means fipy breaks in python 3.12 at the import of the entire future.standard_library. I'm thinking a work around could be, to be more selective about what parts of future are imported?

[guyer]

I'm impressed you got FiPy to install with Python 3.12 at all. I've fixed this particular issue on #1023. That won't be merged to master until I can expunge Python 2.7 (RealSoonNow (tm)) (versioneer.py cannot be compatible with Python 2.7 and Python 3.12).