Fix Py_UnbufferedStdioFlag deprecation warning #3265
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Fix python initialization using config. Fix releasing python config after use.
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The use of Py_UnbufferedStdioFlag has been deprecated in python 3.12 (current debian:sid and other distros) and will be removed in 3.14. This PR fixes the warning (see also: #3203) and also fixes additional problems with the PyConfig code.
@rene-dev: The python documentation states that you need to use Py_InitializeFromConfig() when you change the PyConfig and you need to release the configuration with PyConfig_Clear() (see: https://docs.python.org/3.12/c-api/init_config.html#initialization-with-pyconfig).
Note: the merging #2487 to fix a previous deprecation warning introducing use of PyConfig caused all python versions lower than 3.8 to fail or anything older than Bullseye (see https://wiki.debian.org/Python). Therefore, no CPP conditional are placed around the code to support older distributions.