[bug#67921] [PATCH haskell-team 2/3] gnu: ghc: Use version 9.4.8 as the default

[Saku Laesvuori via Guix-patches via <guix-patches@gnu.org>]

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> Hi,
> 
> > * gnu/packages/haskell.scm (ghc-9.4): Rename from ghc-next to ghc.
> 
> why 9.4 and not 9.6? Stackage 22.0 for 9.6 has just been released and
> if we go for a big upgrade (you’ll have to update the entire Haskell
> ecosystem if you update GHC), we might as well just make the jump to
> GHC 9.6 and Stackage 22.0.

Because I wrote that patch when there wasn't yet a Stackage release for
ghc 9.6. But if a stackage release for it has now been released I'll try
updating it to 9.6.

Regarding the big upgrade, I have been wondering how could the cabal
revisions be updated automatically. Is there a simpler way than to

1. include a procedure for editing the declaration in the <upstream-updater> 
2. refactor the entire updater code to use that procedure
3. implement completely new logic for adding fields to package definitions?

That seems like a lot of work in code that I don't know all that well.
Is there some reason why the revision is not part of the package
version? Moving it there would probably be much easier than modifying
guix refresh (but then again, if those modifications should be done
anyway it doesn't really reduce the amount of work)

- Saku

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