Update dependency yargs to v18

Author: renovate[bot]

package.json

@@ -108,7 +108,7 @@
   "dependencies": {
     "ethers": "^6.15.0",
     "viem": "^2.23.2",
-    "yargs": "^17.7.2",
+    "yargs": "^18.0.0",
     "zod": "^4.0.15"
   },
   "packageManager": "pnpm@10.28.0"