fix error that was accidentially

introduced in previous commit.
forgot to actually assign
mitre_attack_enrichments to self
after resolving them

Author: pyth0n1c

contentctl/objects/detection_tags.py

@@ -147,6 +147,8 @@ def addAttackEnrichment(self, info: ValidationInfo):
         if len(missing_tactics) > 0:
             raise ValueError(f"Missing Mitre Attack IDs. {missing_tactics} not found.")
 
+        self.mitre_attack_enrichments = mitre_enrichments
+
         return self
 
     """