Slicer upgrade from Python 3.9.10 to Python 3.12

Windows nightly is still Python 3.9.10 (main, Jun 9 2025, 23:19:40) [MSC v.1942 64 bit (AMD64)] on win32. Is a build necessary?

As discussed during the weekly hangout from June 10th, we transition from Python 3.9.10 to 3.12.10 is in progress and not yet integrated into the main branch.

See Slicer Preview upgraded to Python 3.12

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