[client] Add x_opencti_stix_ids in sightings

Author: richard-julien

pycti/utils/opencti_stix2.py

@@ -1395,6 +1395,11 @@ def import_sighting(
                 if "x_opencti_workflow_id" in stix_sighting
                 else None
             ),
+            x_opencti_stix_ids=(
+                stix_sighting["x_opencti_stix_ids"]
+                if "x_opencti_stix_ids" in stix_sighting
+                else None
+            ),
             update=update,
             ignore_dates=(
                 stix_sighting["x_opencti_ignore_dates"]