Fixed the {in,out}_edges() function of the DiGraph class. (#1527)

The function ignored their `node` argument, thus they always returned
all edges.

dace/sdfg/graph.py

@@ -526,10 +526,10 @@ def edges(self):
         return [DiGraph._from_nx(e) for e in self._nx.edges()]
 
     def in_edges(self, node):
-        return [DiGraph._from_nx(e) for e in self._nx.in_edges()]
+        return [DiGraph._from_nx(e) for e in self._nx.in_edges(node, True)]
 
     def out_edges(self, node):
-        return [DiGraph._from_nx(e) for e in self._nx.out_edges()]
+        return [DiGraph._from_nx(e) for e in self._nx.out_edges(node, True)]
 
     def add_node(self, node):
         return self._nx.add_node(node)