Python 3.13 fix for missing dict segfault

Python 3.13 removed a safety net from PyModule_Type's tp_init slot
that created the module's md_dict member if it was NULL.  This
safety net was removed because, since Python 3.11, the md_dict is
created by tp_new and is never expected to be NULL.  So, in our
own code, we must ensure that tp_new is called before tp_init.

Wrapping/PythonCore/PyVTKNamespace.cxx

@@ -112,8 +112,10 @@ PyObject* PyVTKNamespace_New(const char* name)
   {
     // make sure python has readied the type object
     PyType_Ready(&PyVTKNamespace_Type);
-    // call the allocator provided by python for this type
-    self = PyVTKNamespace_Type.tp_alloc(&PyVTKNamespace_Type, 0);
+    // call the superclass new function
+    PyObject* empty = PyTuple_New(0);
+    self = PyVTKNamespace_Type.tp_base->tp_new(&PyVTKNamespace_Type, empty, nullptr);
+    Py_DECREF(empty);
     // call the superclass init function
     PyObject* pyname = PyUnicode_FromString(name);
     PyObject* args = PyTuple_Pack(1, pyname);

Wrapping/PythonCore/PyVTKTemplate.cxx

@@ -761,8 +761,10 @@ PyObject* PyVTKTemplate_New(const char* name, const char* docstring)
 {
   // make sure python has readied the type object
   PyType_Ready(&PyVTKTemplate_Type);
-  // call the allocator provided by python for this type
-  PyObject* self = PyVTKTemplate_Type.tp_alloc(&PyVTKTemplate_Type, 0);
+  // call the superclass new function
+  PyObject* empty = PyTuple_New(0);
+  PyObject* self = PyVTKTemplate_Type.tp_base->tp_new(&PyVTKTemplate_Type, empty, nullptr);
+  Py_DECREF(empty);
   // call the superclass init function
   PyObject* pyname = PyUnicode_FromString(name);
   PyObject* pydoc = PyUnicode_FromString(docstring);