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Declare a Python 3.13 toolchain, revert setup.py toolchain arget selection (#1876)

The new solution was too smart (read: dense), because it did not account for
the fact that we look for the Windows libs of the interpreter building
the wheel, not the hermetic one supplying the header files.

The fix is to just align the versions again, so that the libs and headers
come from the same minor version.