Remove duplicated ironic tag

Author: seunghun1ee

etc/kayobe/kolla-image-tags.yml

@@ -19,8 +19,6 @@ kolla_image_tags:
     ubuntu-jammy: 2024.1-ubuntu-jammy-20241004T094540
   horizon:
     rocky-9: 2024.1-rocky-9-20240909T144917
-  ironic:
-    rocky-9: 2024.1-rocky-9-20241004T183935
   bifrost_deploy:
     rocky-9: 2024.1-rocky-9-20240725T165045
   prometheus: