We used runs-on: ubuntu-22.04 as temporary solution in here: #6743

Check out some failed actions:

• https://github.com/getkirby/kirby/actions/runs/11329888134
• https://github.com/getkirby/kirby/actions/runs/11327943110

NOTE: Maybe the title may sound like an IM issue. But as far as I understand, the problem is related to Kirby. The commands supported by Kirby in IM6 and IM7 do not match. For example, the convert command seems to be deprecated and replaced by the magick command.