build(deps): bump document-schema.js to 2.4.0

Triggered instantly via repository_dispatch when document-schema.js published its own release,
rather than waiting for the next scheduled Dependabot scan.

Author: github-actions[bot]

package.json

@@ -69,7 +69,7 @@
   "license": "MIT",
   "packageManager": "pnpm@11.6.0",
   "dependencies": {
-    "document-schema.js": "^2.3.5",
+    "document-schema.js": "^2.4.0",
     "zod": "^4.4.3"
   },
   "devDependencies": {