Fix MG Test Failing due to Removal of np.float (#3621)

Updates a test that was using `np.float` to use `np.float64` instead to resolve a test failure.

Authors:
  - Alex Barghi (https://github.com/alexbarghi-nv)

Approvers:
  - Vibhu Jawa (https://github.com/VibhuJawa)
  - Brad Rees (https://github.com/BradReesWork)

URL: #3621

python/cugraph/cugraph/tests/internals/test_renumber_mg.py

@@ -113,7 +113,7 @@ def test_mg_renumber_add_internal_vertex_id(graph_file, dask_client):
     gdf["dst_old"] = destinations
     gdf["src"] = sources + translate
     gdf["dst"] = destinations + translate
-    gdf["weight"] = gdf.index.astype(np.float)
+    gdf["weight"] = gdf.index.astype(np.float64)
 
     ddf = dask.dataframe.from_pandas(
         gdf, npartitions=len(dask_client.scheduler_info()["workers"])