chore(deps): update dependency zod to v4

Author: renovate[bot]

package.json

@@ -22,7 +22,7 @@
     "better-sqlite3": "^12.2.0",
     "nuxt": "^4.0.0",
     "nuxt-og-image": "^5.1.9",
-    "zod": "^3.25.76"
+    "zod": "^4.0.8"
   },
   "devDependencies": {
     "@nuxt/eslint": "^1.5.2",