fix(deps): update dependency zod to v4

Author: renovate[bot]

package.json

@@ -18,7 +18,7 @@
     "fs-extra": "^11.2.0",
     "toml-eslint-parser": "^0.10.0",
     "upath": "^2.0.0",
-    "zod": "^3.23.0"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "@eslint/js": "9.9.1",