Python 3.11 gives SystemError: type Boost.Python.enum has the Py_TPFLAGS_HAVE_GC flag but has no traverse function

Up to Python 3.10 our Boost Python binding ran fine.
As of Python 3.11 we get the following error upon import of the binding;

`SystemError: type Boost.Python.enum has the Py_TPFLAGS_HAVE_GC flag but has no traverse function`

Running;
Python 3.11.0 (main, Oct 24 2022, 18:26:48) [MSC v.1933 64 bit (AMD64)] on win32
boost_1_80_0
b2 -j%NUMBER_OF_PROCESSORS% python=3.11 --with-python --stage-libdir=lib64-msvc-14.3 --build-type=complete toolset=msvc-14.3 address-model=64 architecture=x86 debug-symbols=on stage

If I remove line 116 of libs\python\src\object\enum.cpp I don't get the error.

```

#if PY_VERSION_HEX < 0x03000000
| Py_TPFLAGS_CHECKTYPES
#endif
| Py_TPFLAGS_HAVE_GC /* <============== remove this line */
| Py_TPFLAGS_BASETYPE, /* tp_flags */

```

Is it safe to do this?