Changes to Update Notifications

added the new contact_accepted enum value to the items/type response property for the response status 200

added the new user_message enum value to the items/type response property for the response status 200

added the new workspaceuser_added_collaborator enum value to the items/type response property for the response status 200

added the new workspaceuser_added_guest enum value to the items/type response property for the response status 200

added the new workspaceuser_added_owner enum value to the items/type response property for the response status 200

added the new workspaceuser_removed enum value to the items/type response property for the response status 200

added the new workspaceuser_updated_collaborator enum value to the items/type response property for the response status 200

added the new workspaceuser_updated_guest enum value to the items/type response property for the response status 200

added the new workspaceuser_updated_owner enum value to the items/type response property for the response status 200

added the new optional request property updates/items/read

the request property updates/items/content became optional

request property updates/items/content list-of-types was widened by adding types null to media type application/json

endpoint added