Update dependency ethers to v6

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@rainbow-me/rainbowkit": "0.8.1",
-    "ethers": "5.7.2",
+    "ethers": "6.0.0",
     "next": "13.1.6",
     "react": "18.2.0",
     "react-dom": "18.2.0",