haskellPackages.cabalSdist: remove ghc workaround

The workaround added in https://github.com/NixOS/nixpkgs/pull/187726
for https://github.com/haskell/cabal/issues/8352 is no longer needed.

cabal-install 3.8.1.0 introduced a regression where `cabal sdist`
required GHC to be in PATH. This was fixed in cabal-install 3.10.1.0
(https://github.com/haskell/cabal/pull/8358), and nixpkgs now uses
cabal-install 3.16.0.0.

tests.haskell.cabalSdist passes.

pkgs/development/haskell-modules/make-package-set.nix

@@ -674,10 +674,6 @@ package-set { inherit pkgs lib callPackage; } self
         inherit src;
         nativeBuildInputs = [
           buildHaskellPackages.cabal-install
-
-          # TODO after https://github.com/haskell/cabal/issues/8352
-          #      remove ghc
-          self.ghc
         ];
         dontUnpack = false;
       }