Enable automatic closure of older CI failure issues (#14555)

Author: Copilot

.github/workflows/ci-doctor.lock.yml

@@ -31,6 +31,7 @@ safe-outputs:
     expires: 1d
     title-prefix: "[CI Failure Doctor] "
     labels: [cookie]
+    close-older-issues: true
   add-comment:
   update-issue:
   noop: