Purge node cache on destroy to prevent stale identity lookups

Made-with: Cursor

Author: Andy-Jost

cuda_core/cuda/core/_graph/_graph_def/_graph_node.pyx

@@ -153,6 +153,7 @@ cdef class GraphNode:
             return
         with nogil:
             HANDLE_RETURN(cydriver.cuGraphDestroyNode(node))
+        _node_cache.pop(<uintptr_t>self._h_node.get(), None)
         invalidate_graph_node_handle(self._h_node)
 
     @property