test: update genesis-utxo on staging (#472)

Author: rsporny

e2e-tests/config/substrate/staging_nodes.json

@@ -1,8 +1,8 @@
 {
-    "deployment_mc_epoch": 813,
-    "initial_pc_epoch": 4824881,
-    "genesis_utxo": "0c1fe996e4bdc2480d1e16c57823b4c5cd80b190d0814212977835ecce24afe3#1",
-    "deployment_version": "v1.5.0-rc4",
+    "deployment_mc_epoch": 835,
+    "initial_pc_epoch": 4830116,
+    "genesis_utxo": "de7b8efb08243b770be30cfa22a9ed64317c50052bb4394392960ddcc9810048#1",
+    "deployment_version": "v1.5.0-rc7",
     "test_environment": "staging",
     "nodes_config": {
         "nodes": {