fix(deps): update dependency @netlify/functions to v4

Author: renovate[bot]

package.json

@@ -14,7 +14,7 @@
     "@astrojs/react": "^4.2.1",
     "@fontsource-variable/inter": "^5.2.5",
     "@netlify/blobs": "^8.2.0",
-    "@netlify/functions": "^2.8.2",
+    "@netlify/functions": "^4.2.4",
     "@tailwindcss/vite": "^4.0.14",
     "@types/react": "^18.2.79",
     "@types/react-dom": "^18.2.25",