haskell-language-server: ghc 8.10.3 -> ghc 8.10.4

[leifhelm]

Motivation for this change

To make things work out of the box

Things done

Change default ghc to the current one (8.10.4).

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[maralorn]

I wonder why I always overlook this. We should find a better way to keep this in sync.

Can you cherry-pick this change onto the haskell-updates branch and change the merge target to that branch?

[leifhelm]

I hope I did what you asked me to do

[maralorn]

Perfect!

Thank you!

Merging when ofBorg passes!