Update dependency ethers to v6

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
     "@subsquid/evm-processor": "^0.3.2",
     "@subsquid/file-store-csv": "^0.2.0",
     "dotenv": "^16.0.0",
-    "ethers": "^5.6.4"
+    "ethers": "^6.0.0"
   },
   "devDependencies": {
     "@subsquid/evm-typegen": "2.0.4",