[GraphBolt][CUDA] Fix pinned `edge_id` index_select (#6898)

python/dgl/graphbolt/impl/fused_csc_sampling_graph.py

@@ -417,10 +417,8 @@ class FusedCSCSamplingGraph(SamplingGraph):
             and ORIGINAL_EDGE_ID in self.edge_attributes
         )
         if has_original_eids:
-            original_edge_ids = torch.index_select(
-                self.edge_attributes[ORIGINAL_EDGE_ID],
-                dim=0,
-                index=original_edge_ids,
+            original_edge_ids = torch.ops.graphbolt.index_select(
+                self.edge_attributes[ORIGINAL_EDGE_ID], original_edge_ids
             )
         if type_per_edge is None:
             # The sampled graph is already a homogeneous graph.