Update members list and cache

Author: actions-user

assets/people/members_cache.json

@@ -97,7 +97,7 @@
     },
     "Eunsik Choi.md": {
         "name": "Eunsik Choi",
-        "category": "Doctoral Students",
+        "category": "Postdoctoral researcher",
         "photo": "최은식.jpg",
         "position": [],
         "alumniType": [],