Upgrade plutus to build with ghc-9.6

[erikd]

[x] Make it build
[ ] Add it to CI
[x] Upload to CHaP

[erikd]

PR is #5286

[angerman]

@michaelpj would you be able to review this?

[michaelpj]

I'm aware of it. I've also got the CI bit more-or-less ready to go.

I think we might want to make some individual sub-tasks for the stuff we need to do to get it on CHaP. There are a lot of dependencies that need updating.

[angerman]

@michaelpj

I think we might want to make some individual sub-tasks for the stuff we need to do to get it on CHaP.

fully agreed. @erikd can you create the subtasks? I doubt there are real subtasks in GH, but we can just create multiple tickets and link them here, I believe.

[michaelpj]

I've narrowed down the problems to just a few. Lots has been fixed on Hackage recently. Listing the remaining ones here:

• ghc-9.4 build error on M1 well-typed/cborg#311 blocks basically everything on 9.6 on aarch64-darwin, but WT know about it
• 9.6 support typeclasses/hex-text#7 . Just needs a revision.
• Bump template-haskell, supporting 2.19 from ghc 9.4 mokus0/th-extras#20 . Just needs a revision.
• int-cast is basically unmaintained, just needs a revision, but probably we should just purge it
• inline-r need more than just bound relaxation alas. But all the stuff we need is in master, so it just needs a release. Make a release? tweag/HaskellR#415
• The known foundation issue

I've commented/opened issues throughout, will try and act on int-cast soonish.

[erikd]

Still need to upload this to CHaP.

[michaelpj]

We do a release at the end of every sprint.

[erikd]

When is that?

[michaelpj]

I just did one.