Update OSM-US.json - Remove Mapping USA 2022 event

Removes Mapping USA 2022 event.

Author: danieldegroot2

resources/north-america/united_states/OSM-US.json

@@ -13,16 +13,5 @@
   },
   "contacts": [
     {"name": "OpenStreetMap US", "email": "team@openstreetmap.us"}
-  ],
-  "events": [
-    {
-      "id": "mappingusa2022",
-      "i18n": true,
-      "name": "Mapping USA 2022",
-      "description": "Join us for a free virtual conference in celebration of the Wiki and OpenStreetMap communities across North America!",
-      "where": "virtual",
-      "when": "2022-nov-10",
-      "url": "https://pretix.eu/openstreetmapus/wcna-mappingusa/"
-    }
   ]
 }