Avoid updating ticket_information with incident info

Before this ticket_information was updated when setting labels determined by mapping
This lead to the label of the previous incident being saved

src/argus_ticket_github.py

@@ -56,7 +56,8 @@ def get_labels(
         ticket_information: dict, serialized_incident: dict
     ) -> tuple[dict, List[str]]:
         incident_tags = GithubPlugin.convert_tags_to_dict(serialized_incident["tags"])
-        labels = ticket_information.get("labels_set", [])
+        labels = []
+        labels.extend(ticket_information.get("labels_set", []))
         labels_mapping = ticket_information.get("labels_mapping", [])
         missing_fields = []