How to coordinate Haddock MR with GHC MR?

GHC merge request !7442 changes the GHC API in a way that requires a one-line change in `utils/haddock`. What should I do with this? I can create an MR for the Haddock people, but I don't know how to mark it as something that should be applied at exactly the same time that Haddock transitions to GHC 9.6. Please advise. Norman