9.12.4 proper

[hasufell]

• I have read https://github.com/haskell/ghcup-metadata?tab=readme-ov-file#contributions and https://www.haskell.org/ghcup/dev/
• I did not use an LLM to generate this patch or parts of it
• I understand that PRs may take 1-2 weeks to be reviewed and merged

[hasufell]

https://github.com/haskell/ghcup-metadata/actions/runs/23791525653