fix: set default network option to 'hardhat' in deployment workflow

Author: gfournierPro

.github/workflows/deploy-smart-contracts.yml

@@ -11,6 +11,7 @@ on:
           - avalancheFujiTestnet
           - arbitrumSepolia
           - bellecour
+        default: 'hardhat'
       environment:
         description: 'Environment'
         required: true