fix(deps): update dependency ethers to v6

Author: renovate[bot]

package.json

@@ -41,7 +41,7 @@
     }
   },
   "dependencies": {
-    "ethers": "5.7.2"
+    "ethers": "6.6.1"
   },
   "devDependencies": {
     "@nomiclabs/hardhat-ethers": "2.2.3",