PyWeakref_GetObject removed in Python 3.15

[musicinmybrain]

For Python 3.15, the PyWeakref_GetObject function, deprecated since Python 3.13, will be removed from the Python C API. The recommendation is to use PyWeakref_GetRef) instead.

The following uses of PyWeakref_GetObject need to be replaced for compatibility with Python 3.15.

OpenUSD/pxr/base/tf/pyWeakObject.cpp

Lines 115 to 121 in 0c7c52b

	pxr_boost::python::object
	Tf_PyWeakObject::GetObject() const
	{
	return pxr_boost::python::object
	(pxr_boost::python::handle<>
	(pxr_boost::python::borrowed(PyWeakref_GetObject(_weakRef.get()))));
	}

OpenUSD/pxr/base/tf/pyIdentity.cpp

Lines 135 to 142 in 0c7c52b

	PyObject *
	Tf_PyIdHandle::Ptr() const {
	if (_weakRef) {
	TfPyLock lock;
	return PyWeakref_GetObject(_weakRef);
	}
	return 0;
	}

OpenUSD/pxr/base/tf/pyFunction.h

Line 52 in 0c7c52b

object callable(handle<>(borrowed(PyWeakref_GetObject(weak.ptr()))));

OpenUSD/pxr/base/tf/pyFunction.h

Line 71 in 0c7c52b

PyObject *self = PyWeakref_GetObject(weakSelf.ptr());

Originally reported downstream in Fedora.

[musicinmybrain]

Related: python/cpython#133644, python/cpython#133657.

[jesschimein]

Filed as internal issue #USD-11846

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