Set PYTHON_NODE_VERSION environment variable to 24 (#614)

See:
python/cpython#136852

Author: hoodmane

master/custom/factories.py

@@ -1350,6 +1350,7 @@ def setup(self, **kwargs):
                 "/bin",
             ]),
             "EMSDK": "/home/emscripten/emsdk",
+            "PYTHON_NODE_VERSION": "24",
         }
 
         self.addSteps([