fix(deps): update dependency zod to v4

Author: renovate[bot]

package-lock.json

@@ -197,7 +197,7 @@
     "chalk": "5.4.1",
     "json-stringify-pretty-compact": "4.0.0",
     "luxon": "3.7.1",
-    "zod": "3.25.76"
+    "zod": "4.0.8"
   },
   "devDependencies": {
     "@ava/typescript": "6.0.0",