chore: sync AWS models (#951)

Author: aajtodd

.changes/8e75f266-7a58-43de-a2e2-e302fda060e2.json

@@ -0,0 +1,5 @@
+{
+    "id": "8e75f266-7a58-43de-a2e2-e302fda060e2",
+    "type": "misc",
+    "description": "Sync AWS service models."
+}

codegen/sdk/aws-models/account.json

@@ -1595,7 +1595,8 @@
                 "smithy.api#paginated": {
                     "inputToken": "NextToken",
                     "outputToken": "NextToken",
-                    "pageSize": "MaxResults"
+                    "pageSize": "MaxResults",
+                    "items": "Regions"
                 },
                 "smithy.api#readonly": {},
                 "smithy.api#suppress": [
@@ -2061,4 +2062,4 @@
             }
         }
     }
-}
+}