[client] Removed linked-to ref reference

Author: JeremyCloarec

pycti/utils/constants.py

@@ -129,7 +129,6 @@ class MultipleRefRelationship(Enum):
     CHILD = "child"
     BODY_MULTIPART = "body-multipart"
     VALUES = "values"
-    LINKED = "x_opencti_linked-to"
     SERVICE_DDL = "service-dll"
     INSTALLED_SOFTWARE = "installed-software"
     RELATION_ANALYSIS_SCO = "analysis-sco"