chore: update meetings.json, newsrooom_videos.json and dashboard.json

Author: asyncapi-bot

config/meetings.json

@@ -6,13 +6,6 @@
     "banner": "",
     "date": "2025-10-06T14:00:00.000Z"
   },
-  {
-    "title": "Marketing WG Meeting",
-    "calLink": "https://www.google.com/calendar/event?eid=Z2hrM2IzcTZma2FpbzlrNzJicDlxZjU1ZWMgY19xOXRzZWlnbG9tZHNqNm5qdWh2YnB0czExY0Bn",
-    "url": "https://github.com/asyncapi/community/issues/1968",
-    "banner": "",
-    "date": "2025-07-08T14:00:00.000Z"
-  },
   {
     "title": "AsyncAPI Community WG Meeting",
     "calLink": "https://www.google.com/calendar/event?eid=c3Zkbmp1dmU3OGlpa203Y2pxYWt1cTNxZjggY19xOXRzZWlnbG9tZHNqNm5qdWh2YnB0czExY0Bn",