fix(deps): update dependency zod to v4.3.0

Author: renovate[bot]

package.json

@@ -17,7 +17,7 @@
     "astro": "6.0.0-alpha.4",
     "sanitize-html": "2.17.0",
     "tailwindcss": "4.1.18",
-    "zod": "4.2.1"
+    "zod": "4.3.0"
   },
   "devDependencies": {
     "@biomejs/biome": "2.3.10",