Fix a crash in the free threading build when :c:func:`PyCode_GetCode`,
:c:func:`PyCode_GetVarnames`, :c:func:`PyCode_GetCellvars`, or
:c:func:`PyCode_GetFreevars` were called from multiple threads at the same
time.
Fix a crash in the free threading build when :c:func:`PyCode_GetCode`,
:c:func:`PyCode_GetVarnames`, :c:func:`PyCode_GetCellvars`, or
:c:func:`PyCode_GetFreevars` were called from multiple threads at the same
time.