Cleanup: use nullptr instead of zero

source/blender/python/gpu/gpu_py_uniformbuffer.cc

@@ -70,7 +70,7 @@ static PyObject *pygpu_uniformbuffer__tp_new(PyTypeObject * /*self*/,
       "O" /* `data` */
       ":GPUUniformBuf.__new__",
       _keywords,
-      0,
+      nullptr,
   };
   if (!_PyArg_ParseTupleAndKeywordsFast(args, kwds, &_parser, &pybuffer_obj)) {
     return nullptr;