Bump rdf-dereference from 3.0.0 to 4.0.0 in /webserver

Bumps [rdf-dereference](https://github.com/rubensworks/rdf-dereference.js) from 3.0.0 to 4.0.0.
- [Changelog](https://github.com/rubensworks/rdf-dereference.js/blob/master/CHANGELOG.md)
- [Commits](rubensworks/rdf-dereference.js@v3.0.0...v4.0.0)

---
updated-dependencies:
- dependency-name: rdf-dereference
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

webserver/package.json

@@ -42,7 +42,7 @@
     "mdast-util-find-and-replace": "^3.0.2",
     "n3": "^1.25.2",
     "prisma": "^6.6.0",
-    "rdf-dereference": "^3.0.0",
+    "rdf-dereference": "^4.0.0",
     "rehype-sanitize": "^6.0.0",
     "rehype-stringify": "^10.0.1",
     "remark-parse": "^11.0.0",