fix(portaswitch): resolve type error by converting aliases to strings

Author: yakimenko73

app/bss/adapters/portaswitch/adapter.py

@@ -412,7 +412,7 @@ def retrieve_contacts(self, session: SessionInfo, user: UserInfo) -> list[Contac
 
                     for ext in extensions:
                         if ext["type"] in allowed_ext_types and ext.get("i_account") != i_account:
-                            aliases = account_to_aliases.get(ext.get("i_account"), [])
+                            aliases = [str(alias) for alias in account_to_aliases.get(ext.get("i_account"), [])]
                             contacts.append(Serializer.get_contact_info_by_extension(ext, aliases, i_account))
                 case PortaSwitchContactsSelectingMode.ACCOUNTS:
                     accounts = self._admin_api.get_account_list(i_customer)["account_list"]