Bug#1057665: python-mapnik: Segfault when importing with python3.12

[Sebastiaan Couwenberg]

This looks a lot like this issue:

  https://github.com/mapnik/python-mapnik/issues/231

That was caused by boost-python not being built with the same Python 
version.

Because the module still works with the default python the severity is 
reduced. If this issue persists when python3.12 is the default the 
severity will be raised again.

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