Enable haskell-language-server for ghc9101

[jmatsushita]

• ghc9101 is fully supported since haskell-language-server-2.9.0.0 https://github.com/haskell/haskell-language-server/pull/4319/files#diff-79cf716c1820425aff19ccc293f5526d96964620e8686a6da542d9c416474b7b

Also ties loose end from #337720 (comment)

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[maralorn]

Oh, damnit. I thought that did happen, but then it got drowned in the CI noise.

[maralorn]

Thank you for finding that.

[jmatsushita]

UPDATE: I think I figured it out in #354537

Hey @maralorn I was sort of expecting for this change to result in haskell.packages.ghc910.haskell-language-server to be build by hydra and available in the nixos cache, however I can see haskell.packages.ghc98.haskell-language-server but https://hydra.nixos.org/job/nixpkgs/staging-next/haskell.packages.ghc910.haskell-language-server.x86_64-linux shows:

This job is not a member of the latest evaluation of its jobset. This means it was removed or had an evaluation error.

I don't really understand how all of this work, so suppose I was mistaken, but maybe you can help me figure out how to achieve this? Thanks !