Update dependency @openzeppelin/contracts to ^4.9.6

Author: renovate[bot]

hardhat/package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "@ethereumjs/block": "^5.1.1",
     "@ethereumjs/common": "^4.2.0",
-    "@openzeppelin/contracts": "^4.9.5",
+    "@openzeppelin/contracts": "^4.9.6",
     "ethers": "^6.10.0"
   },
   "devDependencies": {