chore: deploy horizon step 4 for testnet

Signed-off-by: Tomás Migone <[email protected]>

Author: tmigone

packages/contracts/hardhat.config.ts

@@ -42,7 +42,7 @@ const config: HardhatUserConfig = {
     },
     arbitrumSepolia: {
       chainId: 421614,
-      url: process.env.ARBITRUM_SEPOLIA_URL,
+      url: process.env.ARBITRUM_SEPOLIA_URL || 'https://sepolia-rollup.arbitrum.io/rpcblock',
       accounts: {
         mnemonic: DEFAULT_TEST_MNEMONIC,
       },

packages/horizon/ignition/configs/migrate.arbitrumSepolia.json5

@@ -27,9 +27,9 @@
     "subgraphServiceAddress": "0xc24A3dAC5d06d771f657A48B20cE1a671B78f26b",
 
     // Must be set for step 4 of the migration
-    "horizonStakingImplementationAddress": "",
-    "curationImplementationAddress": "",
-    "rewardsManagerImplementationAddress": "",
+    "horizonStakingImplementationAddress": "0x2AF6F51e119A79497C3A3FFf012B5889da489764",
+    "curationImplementationAddress": "0xbC8F4355f346e47eef8A0DBFF4a58616ACf7DaCA",
+    "rewardsManagerImplementationAddress": "0x856843F6409a8b3A0d4aaE67313037FED02bBBFf",
 
     // Global parameters
     "maxThawingPeriod": 2419200