fix(deps): update dependency zod to v4.3.6

Author: renovate[bot]

package.json

@@ -52,7 +52,7 @@
     "react-hook-form": "7.69.0",
     "react-icons": "5.5.0",
     "resend": "^6.9.2",
-    "zod": "4.2.1"
+    "zod": "4.3.6"
   },
   "devDependencies": {
     "@biomejs/biome": "2.4.8",