Update resource list

Author: Autogenerator Pipeline

generator/resources.json

@@ -1771,11 +1771,16 @@
   ],
   "Microsoft.DigitalTwins/digitalTwinsInstances": [
     "2020-03-01-preview",
-    "2020-10-31"
+    "2020-10-31",
+    "2020-12-01"
   ],
   "Microsoft.DigitalTwins/digitalTwinsInstances/endpoints": [
     "2020-03-01-preview",
-    "2020-10-31"
+    "2020-10-31",
+    "2020-12-01"
+  ],
+  "Microsoft.DigitalTwins/digitalTwinsInstances/privateEndpointConnections": [
+    "2020-12-01"
   ],
   "Microsoft.DocumentDB/databaseAccounts": [
     "2015-04-01",