GHC 9.12.1 updates and rc1 status

Hi all, We had planned to release 9.12.1-rc1 today. Unfortunately, we discovered a few regressions and bugs which need to be fixed before we can publish a release candidate, including #25382, #25375 and !13633. I am currently waiting for some of these fixes to land in master before backporting them to the release branch. I will try to have the release candidate out on Monday the 25th. The final release is currently scheduled for December 6th. We will inform you if there are any changes to this schedule. Cheers, Zubin.