PyMI does not build on 3.13

[mtnpke]

      PyMI.cpp
      PyMI\PyMI.cpp(37): error C3861: 'PyEval_ThreadsInitialized': identifier not found
      PyMI\PyMI.cpp(39): warning C4996: 'PyEval_InitThreads': deprecated in 3.9

PyEval_ThreadsInitialized was deprecated in 3.9 and apparently removed in 3.12

[ader1990]

Hello @mtnpke, this issue was solved by: #54.

Thanks!