chore(deps): update dependency zod to v4.1.8

Author: renovate[bot]

package.json

@@ -101,6 +101,6 @@
     "valibot": "1.1.0",
     "vitest": "^3.0.0",
     "yup": "1.7.0",
-    "zod": "4.1.5"
+    "zod": "4.1.8"
   }
 }