Update dependency zod to v4.1.5

Author: renovate[bot]

package.json

@@ -45,7 +45,7 @@
     "remark-gfm": "4.0.1",
     "remark-mdx-frontmatter": "5.2.0",
     "tailwind-merge": "3.3.1",
-    "zod": "4.1.4"
+    "zod": "4.1.5"
   },
   "devDependencies": {
     "@eslint/eslintrc": "3.3.1",