chore: update to latest rdflib release officially including the json-ld fixes

Author: angelo-v

core/package.json

@@ -53,7 +53,7 @@
     "buffer": "^6.0.3",
     "lunr": "^2.3.9",
     "rdf-namespaces": "^1.16.0",
-    "rdflib": "2.2.37-38360c03",
+    "rdflib": "2.3.0",
     "rxjs": "^7.8.2",
     "slugify": "^1.6.6",
     "url": "^0.11.4"