nx-cugraph: handle seed argument in edge_betweenness_centrality (#3943)

CC @rlratzel who brought this to my attention and can test this fix

Authors:
  - Erik Welch (https://github.com/eriknw)
  - Brad Rees (https://github.com/BradReesWork)

Approvers:
  - Rick Ratzel (https://github.com/rlratzel)

URL: #3943

python/nx-cugraph/nx_cugraph/algorithms/centrality/betweenness.py

@@ -53,6 +53,7 @@ def edge_betweenness_centrality(G, k=None, normalized=True, weight=None, seed=No
         raise NotImplementedError(
             "Weighted implementation of betweenness centrality not currently supported"
         )
+    seed = _seed_to_int(seed)
     G = _to_graph(G, weight)
     src_ids, dst_ids, values, _edge_ids = plc.edge_betweenness_centrality(
         resource_handle=plc.ResourceHandle(),