Bump to Cabal 3.14 and GHC 9.12

[andreasabel]

This commits to Cabal-3.14 and enables build with GHC 9.12.
Things just compiled fine with Cabal-3.14.

However, there might be accommodations necessary for Cabal-3.14.

The nix flake needs update, of course.

[andreasabel]

Dropping GHC < 9.6 since @bgamari introduced constraint transformers >= 0.6.

The remaining CI failure is due to:

• HighLevelTest broken #1392

[andreasabel]

Doctests do not run yet with Cabal-3.14 because of doctest-parallel:

• Support Cabal-3.14 martijnbastiaan/doctest-parallel#94

[andreasabel]

@peterbecich Would you be up to update the nix workflow for Cabal-3.14?

[peterbecich]

@andreasabel yes

[andreasabel]

You can add commits to this PR...

[peterbecich]

@andreasabel , the Flake is updated. It works locally. Merge this when ready please. Once merged, the Nix Flake GitHub Action will cache, and any timeout can be fixed later. Branches do not cache.

[andreasabel]

@gbaz Want to review?

[andreasabel]

Doctests do not run yet with Cabal-3.14 because of doctest-parallel:

Fixed.

[andreasabel]

I am merging this now in the hope of fixing CI.

[andreasabel]

@andreasabel , the Flake is updated. It works locally. Merge this when ready please. Once merged, the Nix Flake GitHub Action will cache, and any timeout can be fixed later. Branches do not cache.

@peterbecich I merged, but unfortunately Nix CI fails on master now: https://github.com/haskell/hackage-server/actions/runs/15539666582

[ulysses4ever]

No space left on device

time to try https://discourse.nixos.org/t/nothing-but-nix-reclaim-130gb-for-nix-in-github-runners/64345?u=ulysses4ever or similar...

[peterbecich]

It seems to have an issue on MacOS #1408
Created issue wimpysworld/nothing-but-nix#28

[ulysses4ever]

On macos you could try something less advanced mentioned in the same Discourse thread: easimon/maximize-build-space@master or rm -rf certain things.