Update dependency @oasisprotocol/sapphire-contracts to ^0.2.14

Author: renovate[bot]

backend/package.json

@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "@nomicfoundation/hardhat-ethers": "^3.0.5",
-    "@oasisprotocol/sapphire-contracts": "^0.2.7",
+    "@oasisprotocol/sapphire-contracts": "^0.2.14",
     "@oasisprotocol/sapphire-hardhat": "^2.19.4",
     "@typechain/ethers-v6": "^0.5.1",
     "@typechain/hardhat": "^9.1.0",