fix(serializers): fix return value of related_to in network

apis_ontology/serializers.py

@@ -252,5 +252,5 @@ def get_type(self, obj) -> str:
         content_type = ContentType.objects.get_for_model(obj)
         return content_type.name
 
-    def get_related_to(self, obj) -> [int]:
+    def get_related_to(self, obj) -> list[int]:
         return sorted(set(obj.related_to))