Update schema-core.json

Author: Pierlou

schema/core/schema-core.json

@@ -25,8 +25,8 @@
     }
   ],
   "sources": [],
-  "created": "2022-03-14T00:00:00Z",
-  "lastModified": "2025-09-12T00:00:00Z",
+  "created": "2022-03-14",
+  "lastModified": "2026-06-08",
   "version": "v0.2.0",
   "contributors": [
     {