chore(deps): update dependency @nomicfoundation/hardhat-ethers to ^3.1.3

Author: renovate[bot]

hardhat/package.json

@@ -36,7 +36,7 @@
     "@ethereumjs/rlp": "^5.0.2",
     "@ethereumjs/trie": "^6.2.1",
     "@noble/hashes": "1.3.2",
-    "@nomicfoundation/hardhat-ethers": "^3.0.5",
+    "@nomicfoundation/hardhat-ethers": "^3.1.3",
     "@oasisprotocol/blockvote-contracts": "workspace:^",
     "@oasisprotocol/sapphire-contracts": "^0.2.14",
     "@oasisprotocol/sapphire-hardhat": "^2.19.4",