Use closed by instead of related merge requests

.triage-policies.yml

@@ -113,7 +113,7 @@ resource_rules:
             - "Status: Need triage"
       - name: Apply in progress if merge request is opened
         conditions:
-          ruby: related_merge_requests.count{ |mr| mr.state == "opened" } > 0
+          ruby: closed_by.count{ |mr| mr.state == "opened" } > 0
           state: opened
           forbidden_labels:
             - "Status: Blocked"