Boost 1.73.0 cannot build with Python 3.10.0a2, see https://bugzilla.redhat.com/show_bug.cgi?id=1896382

In file included from /usr/include/python3.10/pytime.h:6,
                 from /usr/include/python3.10/Python.h:85,
                 from ./boost/python/detail/wrap_python.hpp:178,
                 from ./boost/python/detail/prefix.hpp:13,
                 from ./boost/python/object_core.hpp:10,
                 from ./boost/python/object/enum_base.hpp:8,
                 from libs/python/src/object/enum.cpp:6:
libs/python/src/object/enum.cpp: In function 'boost::python::api::object boost::python::objects::{anonymous}::new_enum_type(const char*, const char*)':
/usr/include/python3.10/object.h:140:29: error: lvalue required as left operand of assignment
  140 | #define Py_TYPE(ob) _Py_TYPE(_PyObject_CAST_CONST(ob))
      |                     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
libs/python/src/object/enum.cpp:156:11: note: in expansion of macro 'Py_TYPE'
  156 |           Py_TYPE(&enum_type_object) = incref(&PyType_Type);
      |           ^~~~~~~

PEP-0620 Disallows using Py_TYPE() as l-value #325

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