fix(deps): update dependency ethers to v6

Author: renovate[bot]

package.json

@@ -50,7 +50,7 @@
   "dependencies": {
     "@polymarket/clob-client": "^5.1.2",
     "@polymarket/order-utils": "^3.0.1",
-    "ethers": "^5.7.2",
+    "ethers": "^6.0.0",
     "pino": "^10.0.0",
     "pino-pretty": "^13.0.0",
     "socket.io-client": "^4.8.1",