[client] Add channel custom STIX entity

Author: SamuelHassine

pycti/__init__.py

@@ -52,8 +52,8 @@
 from .entities.opencti_vulnerability import Vulnerability
 from .utils.constants import (
     CustomObjectCaseIncident,
-    CustomObjectTask,
     CustomObjectChannel,
+    CustomObjectTask,
     CustomObservableBankAccount,
     CustomObservableCredential,
     CustomObservableCryptocurrencyWallet,