use GHC 9.8

Author: peterbecich

flake.nix

@@ -19,7 +19,7 @@
         # has only one.
         packages.default = config.packages.hackage-server;
         haskellProjects.default = {
-          # basePackages = pkgs.haskell.packages.ghc98;
+          basePackages = pkgs.haskell.packages.ghc98;
           settings = {
             hackage-server.check = false;
             # https://community.flake.parts/haskell-flake/dependency#nixpkgs