add dgl to requirements

requirements.txt

@@ -11,6 +11,12 @@ torch_sparse==0.6.18+pt21cu118
 torch_cluster==1.6.3+pt21cu118
 torch_spline_conv==1.2.2+pt21cu118
 
+--find-links https://data.dgl.ai/wheels/cu118/repo.html
+dgl==1.1.3+cu118
+
+--find-links https://data.dgl.ai/wheels-test/repo.html
+dglgo==0.0.2
+
 ogb
 tqdm
 networkx